diff --git a/src/Core/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommand.cs b/src/Core/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommand.cs
index 1b53716537..3347e77c37 100644
--- a/src/Core/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommand.cs
+++ b/src/Core/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommand.cs
@@ -163,6 +163,11 @@ public class UpdateGroupCommand : IUpdateGroupCommand
             // Use generic error message to avoid enumeration
             throw new NotFoundException();
         }
+
+        if (collections.Any(c => c.Type == CollectionType.DefaultUserCollection))
+        {
+            throw new BadRequestException("You cannot modify group access for collections with the type as DefaultUserCollection.");
+        }
     }
 
     private async Task ValidateMemberAccessAsync(Group originalGroup,
diff --git a/test/Core.Test/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommandTests.cs b/test/Core.Test/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommandTests.cs
index 41486e1c00..b9f6964123 100644
--- a/test/Core.Test/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommandTests.cs
+++ b/test/Core.Test/AdminConsole/OrganizationFeatures/Groups/UpdateGroupCommandTests.cs
@@ -156,6 +156,24 @@ public class UpdateGroupCommandTests
             () => sutProvider.Sut.UpdateGroupAsync(group, organization, collectionAccess));
     }
 
+    [Theory, OrganizationCustomize(UseGroups = true), BitAutoData]
+    public async Task UpdateGroup_WithDefaultUserCollectionType_Throws(SutProvider<UpdateGroupCommand> sutProvider,
+        Group group, Group oldGroup, Organization organization, List<CollectionAccessSelection> collectionAccess)
+    {
+        ArrangeGroup(sutProvider, group, oldGroup);
+        ArrangeUsers(sutProvider, group);
+
+        // Return collections with DefaultUserCollection type
+        sutProvider.GetDependency<ICollectionRepository>()
+            .GetManyByManyIdsAsync(Arg.Any<IEnumerable<Guid>>())
+            .Returns(callInfo => callInfo.Arg<IEnumerable<Guid>>()
+                .Select(guid => new Collection { Id = guid, OrganizationId = group.OrganizationId, Type = CollectionType.DefaultUserCollection }).ToList());
+
+        var exception = await Assert.ThrowsAsync<BadRequestException>(
+            () => sutProvider.Sut.UpdateGroupAsync(group, organization, collectionAccess));
+        Assert.Contains("You cannot modify group access for collections with the type as DefaultUserCollection.", exception.Message);
+    }
+
     [Theory, OrganizationCustomize(UseGroups = true), BitAutoData]
     public async Task UpdateGroup_MemberBelongsToDifferentOrganization_Throws(SutProvider<UpdateGroupCommand> sutProvider,
         Group group, Group oldGroup, Organization organization, IEnumerable<Guid> userAccess)