diff --git a/src/libraries/System.Security.Permissions/ref/System.Security.Permissions.cs b/src/libraries/System.Security.Permissions/ref/System.Security.Permissions.cs
index 81c59db3baa11b..0ef3beb0bad3ed 100644
--- a/src/libraries/System.Security.Permissions/ref/System.Security.Permissions.cs
+++ b/src/libraries/System.Security.Permissions/ref/System.Security.Permissions.cs
@@ -31,10 +31,10 @@ public override void FromXml(System.Security.SecurityElement securityElement) {
         public override System.Security.SecurityElement ToXml() { throw null; }
         public override System.Security.IPermission Union(System.Security.IPermission target) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.All, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.All, AllowMultiple=true, Inherited=false)]
     public sealed partial class ConfigurationPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public ConfigurationPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -402,10 +402,10 @@ public override void FromXml(System.Security.SecurityElement securityElement) {
         public override System.Security.SecurityElement ToXml() { throw null; }
         public override System.Security.IPermission Union(System.Security.IPermission target) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
     public sealed partial class SocketPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public SocketPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -444,10 +444,10 @@ public override void FromXml(System.Security.SecurityElement securityElement) {
         public override System.Security.SecurityElement ToXml() { throw null; }
         public override System.Security.IPermission Union(System.Security.IPermission target) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
     public sealed partial class WebPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public WebPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -885,10 +885,10 @@ public void SetPathList(System.Security.Permissions.EnvironmentPermissionAccess
         public override System.Security.SecurityElement ToXml() { throw null; }
         public override System.Security.IPermission Union(System.Security.IPermission other) { throw null; }
     }
-    [System.FlagsAttribute]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.FlagsAttribute]
     public enum EnvironmentPermissionAccess
     {
         NoAccess = 0,
@@ -896,10 +896,10 @@ public enum EnvironmentPermissionAccess
         Write = 2,
         AllAccess = 3,
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
     public sealed partial class EnvironmentPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public EnvironmentPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -1199,10 +1199,10 @@ public KeyContainerPermissionAccessEntryEnumerator() { }
         public bool MoveNext() { throw null; }
         public void Reset() { }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
     public sealed partial class KeyContainerPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public KeyContainerPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -1253,10 +1253,10 @@ public override void FromXml(System.Security.SecurityElement securityElement) {
         public override System.Security.SecurityElement ToXml() { throw null; }
         public override System.Security.IPermission Union(System.Security.IPermission target) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
     public sealed partial class MediaPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
         public MediaPermissionAttribute(System.Security.Permissions.SecurityAction action) : base (default(System.Security.Permissions.SecurityAction)) { }
@@ -1337,10 +1337,10 @@ public void FromXml(System.Security.SecurityElement elem) { }
         public System.Security.SecurityElement ToXml() { throw null; }
         public System.Security.IPermission Union(System.Security.IPermission other) { throw null; }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
 #if NET50_OBSOLETIONS
     [System.ObsoleteAttribute("Code Access Security is not supported or honored by the runtime.", DiagnosticId = "SYSLIB0003", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
 #endif
+    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
     public sealed partial class PrincipalPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
     {
 #if NET50_OBSOLETIONS
diff --git a/src/libraries/System.Security.Permissions/src/System/Configuration/ConfigurationPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Configuration/ConfigurationPermissionAttribute.cs
index 0ca7d38ca2d008..9df7cd35683b29 100644
--- a/src/libraries/System.Security.Permissions/src/System/Configuration/ConfigurationPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Configuration/ConfigurationPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Configuration
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false)]
     public sealed class ConfigurationPermissionAttribute : CodeAccessSecurityAttribute
     {
diff --git a/src/libraries/System.Security.Permissions/src/System/Data/Common/DBDataPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Data/Common/DBDataPermissionAttribute.cs
index 097ba88c304bf4..57a0c5fbd2c84a 100644
--- a/src/libraries/System.Security.Permissions/src/System/Data/Common/DBDataPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Data/Common/DBDataPermissionAttribute.cs
@@ -5,6 +5,9 @@
 
 namespace System.Data.Common
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor| AttributeTargets.Method,
         AllowMultiple =true, Inherited =false)]
     public abstract class DBDataPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Data/OracleClient/OraclePermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Data/OracleClient/OraclePermissionAttribute.cs
index fb871718b77df1..8b702005afc7e1 100644
--- a/src/libraries/System.Security.Permissions/src/System/Data/OracleClient/OraclePermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Data/OracleClient/OraclePermissionAttribute.cs
@@ -5,6 +5,9 @@
 
 namespace System.Data.OracleClient
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct |
         AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
     public sealed class OraclePermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Diagnostics/EventLogPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Diagnostics/EventLogPermissionAttribute.cs
index f06e73cb9cd58e..fdfd74de52aa28 100644
--- a/src/libraries/System.Security.Permissions/src/System/Diagnostics/EventLogPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Diagnostics/EventLogPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Diagnostics
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct
         | AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Event, AllowMultiple = true, Inherited = false)]
     public class EventLogPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Diagnostics/PerformanceCounterPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Diagnostics/PerformanceCounterPermissionAttribute.cs
index 20c92891cdc497..90768d8236992e 100644
--- a/src/libraries/System.Security.Permissions/src/System/Diagnostics/PerformanceCounterPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Diagnostics/PerformanceCounterPermissionAttribute.cs
@@ -5,6 +5,9 @@
 using System.Security.Permissions;
 namespace System.Diagnostics
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Event,
     AllowMultiple = true, Inherited = false)]
     public class PerformanceCounterPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Drawing/Printing/PrintingPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Drawing/Printing/PrintingPermissionAttribute.cs
index 1a16545a647dad..307637f8542bd7 100644
--- a/src/libraries/System.Security.Permissions/src/System/Drawing/Printing/PrintingPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Drawing/Printing/PrintingPermissionAttribute.cs
@@ -5,6 +5,9 @@
 
 namespace System.Drawing.Printing
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
     public sealed class PrintingPermissionAttribute : CodeAccessSecurityAttribute
     {
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/DnsPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/DnsPermissionAttribute.cs
index 89edcd32473724..024858147b93e3 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/DnsPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/DnsPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class |
         AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
     public sealed class DnsPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/Mail/SmtpPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/Mail/SmtpPermissionAttribute.cs
index 9366ed61721081..607fb1bf78d1b6 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/Mail/SmtpPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/Mail/SmtpPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net.Mail
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class |
         AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
     public sealed class SmtpPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/NetworkInformation/NetworkInformationPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/NetworkInformation/NetworkInformationPermissionAttribute.cs
index b8ed459bbfc0a8..80321fe7f85af6 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/NetworkInformation/NetworkInformationPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/NetworkInformation/NetworkInformationPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net.NetworkInformation
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
     public sealed class NetworkInformationPermissionAttribute : CodeAccessSecurityAttribute
     {
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/Collaboration/PeerCollaborationPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/Collaboration/PeerCollaborationPermissionAttribute.cs
index c1fd9c189917b3..5b4b924db05b22 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/Collaboration/PeerCollaborationPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/Collaboration/PeerCollaborationPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net.PeerToPeer.Collaboration
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct |
        AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
     public sealed class PeerCollaborationPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/PnrpPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/PnrpPermissionAttribute.cs
index e85697d11fce49..499eeba5d96a62 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/PnrpPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/PeerToPeer/PnrpPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net.PeerToPeer
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct |
          AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
     public sealed class PnrpPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/SocketPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/SocketPermissionAttribute.cs
index ed5cc2d8b32232..09a111fc98c771 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/SocketPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/SocketPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class |
         AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
     public sealed class SocketPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Net/WebPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Net/WebPermissionAttribute.cs
index 0e584d79e4f094..45621281bb1762 100644
--- a/src/libraries/System.Security.Permissions/src/System/Net/WebPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Net/WebPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Net
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class |
         AttributeTargets.Struct | AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
     public sealed class WebPermissionAttribute : CodeAccessSecurityAttribute
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/CodeAccessPermission.cs b/src/libraries/System.Security.Permissions/src/System/Security/CodeAccessPermission.cs
index fe77fe0f78d359..148282d0c8091a 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/CodeAccessPermission.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/CodeAccessPermission.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public abstract partial class CodeAccessPermission : IPermission, ISecurityEncodable, IStackWalk
     {
         protected CodeAccessPermission() { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/NamedPermissionSet.cs b/src/libraries/System.Security.Permissions/src/System/Security/NamedPermissionSet.cs
index 100f003274826e..372e95632f73f5 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/NamedPermissionSet.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/NamedPermissionSet.cs
@@ -5,6 +5,9 @@
 
 namespace System.Security
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class NamedPermissionSet : PermissionSet
     {
         public NamedPermissionSet(NamedPermissionSet permSet) : base(default(PermissionState)) { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/GacInstalled.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/GacInstalled.cs
index 991f0a38c7b08e..a1520e9222f744 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/GacInstalled.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/GacInstalled.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class GacInstalled : EvidenceBase, IIdentityPermissionFactory
     {
         public GacInstalled() { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/IIdentityPermissionFactory.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/IIdentityPermissionFactory.cs
index 6b9f9da8a0cfb4..92762151cbbfa5 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/IIdentityPermissionFactory.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/IIdentityPermissionFactory.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public partial interface IIdentityPermissionFactory
     {
         IPermission CreateIdentityPermission(Evidence evidence);
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyLevel.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyLevel.cs
index 7a89e9b500f875..477fb70e4a749f 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyLevel.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyLevel.cs
@@ -19,18 +19,33 @@ internal PolicyLevel() { }
         public void AddFullTrustAssembly(StrongName sn) { }
         [Obsolete("Because all GAC assemblies always get full trust, the full trust list is no longer meaningful. You should install any assemblies that are used in security policy in the GAC to ensure they are trusted.")]
         public void AddFullTrustAssembly(StrongNameMembershipCondition snMC) { }
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public void AddNamedPermissionSet(NamedPermissionSet permSet) { }
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public NamedPermissionSet ChangeNamedPermissionSet(string name, PermissionSet pSet) { return default(NamedPermissionSet); }
         [Obsolete("AppDomain policy levels are obsolete. See https://go.microsoft.com/fwlink/?LinkID=155570 for more information.")]
         public static PolicyLevel CreateAppDomainLevel() { return default(PolicyLevel); }
         public void FromXml(SecurityElement e) { }
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public NamedPermissionSet GetNamedPermissionSet(string name) { return default(NamedPermissionSet); }
         public void Recover() { }
         [Obsolete("Because all GAC assemblies always get full trust, the full trust list is no longer meaningful. You should install any assemblies that are used in security policy in the GAC to ensure they are trusted.")]
         public void RemoveFullTrustAssembly(StrongName sn) { }
         [Obsolete("Because all GAC assemblies always get full trust, the full trust list is no longer meaningful. You should install any assemblies that are used in security policy in the GAC to ensure they are trusted.")]
         public void RemoveFullTrustAssembly(StrongNameMembershipCondition snMC) { }
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public NamedPermissionSet RemoveNamedPermissionSet(NamedPermissionSet permSet) { return default(NamedPermissionSet); }
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public NamedPermissionSet RemoveNamedPermissionSet(string name) { return default(NamedPermissionSet); }
         public void Reset() { }
         public PolicyStatement Resolve(Evidence evidence) { return default(PolicyStatement); }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyStatement.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyStatement.cs
index b73ae5d42c254c..788a094602d7f1 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyStatement.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/PolicyStatement.cs
@@ -5,7 +5,13 @@ namespace System.Security.Policy
 {
     public sealed partial class PolicyStatement : ISecurityEncodable, ISecurityPolicyEncodable
     {
+#if NET50_OBSOLETIONS
+        [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public PolicyStatement(PermissionSet permSet) { }
+#if NET50_OBSOLETIONS
+        [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
         public PolicyStatement(PermissionSet permSet, PolicyStatementAttribute attributes) { }
         public PolicyStatementAttribute Attributes { get; set; }
         public string AttributeString { get { return null; } }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Publisher.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Publisher.cs
index 5a149a7acab90f..89fe1cab5c2b6d 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Publisher.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Publisher.cs
@@ -5,6 +5,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class Publisher : EvidenceBase, IIdentityPermissionFactory
     {
         public Publisher(X509Certificate cert) { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Site.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Site.cs
index 8d88da1e9a6d56..c7975c9ec5aabe 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Site.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Site.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class Site : EvidenceBase, IIdentityPermissionFactory
     {
         public Site(string name) { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Url.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Url.cs
index 0264b2c02849a7..e7ec73638ab14a 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Url.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Url.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class Url : EvidenceBase, IIdentityPermissionFactory
     {
         public Url(string name) { }
diff --git a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Zone.cs b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Zone.cs
index c63c8360eaa8db..1f7b0950f57add 100644
--- a/src/libraries/System.Security.Permissions/src/System/Security/Policy/Zone.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Security/Policy/Zone.cs
@@ -3,6 +3,9 @@
 
 namespace System.Security.Policy
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     public sealed partial class Zone : EvidenceBase, IIdentityPermissionFactory
     {
         public Zone(SecurityZone zone) { }
diff --git a/src/libraries/System.Security.Permissions/src/System/ServiceProcess/ServiceControllerPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/ServiceProcess/ServiceControllerPermissionAttribute.cs
index 5c822963b26b6f..34f03504f9291a 100644
--- a/src/libraries/System.Security.Permissions/src/System/ServiceProcess/ServiceControllerPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/ServiceProcess/ServiceControllerPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.ServiceProcess
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Assembly | AttributeTargets.Event, AllowMultiple = true, Inherited = false )]
     public class ServiceControllerPermissionAttribute : CodeAccessSecurityAttribute
     {
diff --git a/src/libraries/System.Security.Permissions/src/System/Transactions/DistributedTransactionPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Transactions/DistributedTransactionPermissionAttribute.cs
index 1bc89cbd615410..9b2844136c2d8f 100644
--- a/src/libraries/System.Security.Permissions/src/System/Transactions/DistributedTransactionPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Transactions/DistributedTransactionPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Transactions
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.All, AllowMultiple = true)]
     public sealed class DistributedTransactionPermissionAttribute : CodeAccessSecurityAttribute
     {
diff --git a/src/libraries/System.Security.Permissions/src/System/Web/AspNetHostingPermissionAttribute.cs b/src/libraries/System.Security.Permissions/src/System/Web/AspNetHostingPermissionAttribute.cs
index ebf6eec3b367b5..9078711ecac83c 100644
--- a/src/libraries/System.Security.Permissions/src/System/Web/AspNetHostingPermissionAttribute.cs
+++ b/src/libraries/System.Security.Permissions/src/System/Web/AspNetHostingPermissionAttribute.cs
@@ -6,6 +6,9 @@
 
 namespace System.Web
 {
+#if NET50_OBSOLETIONS
+    [Obsolete(Obsoletions.CodeAccessSecurityMessage, DiagnosticId = Obsoletions.CodeAccessSecurityDiagId, UrlFormat = Obsoletions.SharedUrlFormat)]
+#endif
     [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false )]
     public sealed class AspNetHostingPermissionAttribute : CodeAccessSecurityAttribute
     {