diff --git a/changelog.d/20240514_201903_krishavrajsingh_duplicateAttribute.md b/changelog.d/20240514_201903_krishavrajsingh_duplicateAttribute.md
new file mode 100644
index 000000000000..81fa2bcae8af
--- /dev/null
+++ b/changelog.d/20240514_201903_krishavrajsingh_duplicateAttribute.md
@@ -0,0 +1,4 @@
+### Fixed
+
+- REST API allowed to create several attributes with the same name within one label
+  (<https://github.com/cvat-ai/cvat/pull/7890>)
diff --git a/cvat/apps/engine/serializers.py b/cvat/apps/engine/serializers.py
index 200e4b001126..7a60922b89c0 100644
--- a/cvat/apps/engine/serializers.py
+++ b/cvat/apps/engine/serializers.py
@@ -321,6 +321,16 @@ def validate(self, attrs):
 
         return attrs
 
+    @staticmethod
+    def check_attribute_names_unique(attrs):
+        encountered_names = set()
+        for attribute in attrs:
+            attr_name = attribute.get('name')
+            if attr_name in encountered_names:
+                raise serializers.ValidationError(f"Duplicate attribute with name '{attr_name}' exists")
+            else:
+                encountered_names.add(attr_name)
+
     @classmethod
     @transaction.atomic
     def update_label(
@@ -336,6 +346,8 @@ def update_label(
 
         attributes = validated_data.pop('attributespec_set', [])
 
+        cls.check_attribute_names_unique(attributes)
+
         if validated_data.get('id') is not None:
             try:
                 db_label = models.Label.objects.get(id=validated_data['id'], **parent_info)
@@ -451,6 +463,8 @@ def create_labels(cls,
         for label in labels:
             attributes = label.pop('attributespec_set')
 
+            cls.check_attribute_names_unique(attributes)
+
             if label.get('id', None):
                 del label['id']