diff --git a/src/Umbraco.Core/Models/ContentEditing/ContentPropertyBasic.cs b/src/Umbraco.Core/Models/ContentEditing/ContentPropertyBasic.cs
index c4a3d7791b..c9ac6b2847 100644
--- a/src/Umbraco.Core/Models/ContentEditing/ContentPropertyBasic.cs
+++ b/src/Umbraco.Core/Models/ContentEditing/ContentPropertyBasic.cs
@@ -68,4 +68,11 @@ public class ContentPropertyBasic
     /// </summary>
     [IgnoreDataMember]
     public IDataEditor? PropertyEditor { get; set; }
+
+    /// <summary>
+    ///     Used internally during model mapping
+    /// </summary>
+    [DataMember(Name = "supportsReadOnly")]
+    [ReadOnly(true)]
+    public bool SupportsReadOnly { get; set; }
 }
diff --git a/src/Umbraco.Core/Models/ContentEditing/ContentPropertyDisplay.cs b/src/Umbraco.Core/Models/ContentEditing/ContentPropertyDisplay.cs
index 5ca8a7ad86..ca8c2f1fc2 100644
--- a/src/Umbraco.Core/Models/ContentEditing/ContentPropertyDisplay.cs
+++ b/src/Umbraco.Core/Models/ContentEditing/ContentPropertyDisplay.cs
@@ -40,7 +40,4 @@ public class ContentPropertyDisplay : ContentPropertyBasic
 
     [DataMember(Name = "readonly")]
     public bool Readonly { get; set; }
-
-    [DataMember(Name = "supportsReadOnly")]
-    public bool SupportsReadOnly { get; set; }
 }
diff --git a/src/Umbraco.Core/Models/Mapping/ContentPropertyBasicMapper.cs b/src/Umbraco.Core/Models/Mapping/ContentPropertyBasicMapper.cs
index d3502cf887..9cda25fbbb 100644
--- a/src/Umbraco.Core/Models/Mapping/ContentPropertyBasicMapper.cs
+++ b/src/Umbraco.Core/Models/Mapping/ContentPropertyBasicMapper.cs
@@ -59,6 +59,7 @@ internal class ContentPropertyBasicMapper<TDestination>
         dest.Alias = property.Alias;
         dest.PropertyEditor = editor;
         dest.Editor = editor.Alias;
+        dest.SupportsReadOnly = editor.SupportsReadOnly;
         dest.DataTypeKey = property.PropertyType!.DataTypeKey;
 
         // if there's a set of property aliases specified, we will check if the current property's value should be mapped.
diff --git a/src/Umbraco.Core/Models/Mapping/MemberTabsAndPropertiesMapper.cs b/src/Umbraco.Core/Models/Mapping/MemberTabsAndPropertiesMapper.cs
index 6b0556d455..ae9876628f 100644
--- a/src/Umbraco.Core/Models/Mapping/MemberTabsAndPropertiesMapper.cs
+++ b/src/Umbraco.Core/Models/Mapping/MemberTabsAndPropertiesMapper.cs
@@ -117,8 +117,6 @@ public class MemberTabsAndPropertiesMapper : TabsAndPropertiesMapper<IMember>
                 prop.IsSensitive = true;
                 // mark this property as readonly so that it does not post any data
                 prop.Readonly = true;
-                // this is readonly so support read-only mode
-                prop.SupportsReadOnly = true;
                 // replace this editor with a sensitive value
                 prop.View = "sensitivevalue";
                 // clear the value
@@ -235,7 +233,6 @@ public class MemberTabsAndPropertiesMapper : TabsAndPropertiesMapper<IMember>
                 View = "boolean",
                 IsSensitive = true,
                 Readonly = false,
-                SupportsReadOnly = true,
             },
 
             new()
@@ -246,7 +243,6 @@ public class MemberTabsAndPropertiesMapper : TabsAndPropertiesMapper<IMember>
                 View = "boolean",
                 IsSensitive = true,
                 Readonly = !member.IsLockedOut, // IMember.IsLockedOut can't be set to true, so make it readonly when that's the case (you can only unlock)
-                SupportsReadOnly = true,
             },
 
             new()
@@ -287,7 +283,6 @@ public class MemberTabsAndPropertiesMapper : TabsAndPropertiesMapper<IMember>
                     property.Value = null;
                     property.View = "sensitivevalue";
                     property.Readonly = true;
-                    property.SupportsReadOnly = true;
                 }
             }
         }
diff --git a/src/Umbraco.Core/PropertyEditors/DataEditor.cs b/src/Umbraco.Core/PropertyEditors/DataEditor.cs
index 115b6a2371..b2b95f475b 100644
--- a/src/Umbraco.Core/PropertyEditors/DataEditor.cs
+++ b/src/Umbraco.Core/PropertyEditors/DataEditor.cs
@@ -75,6 +75,10 @@ public class DataEditor : IDataEditor
     [DataMember(Name = "alias", IsRequired = true)]
     public string Alias { get; set; }
 
+    /// <inheritdoc />
+    [DataMember(Name = "supportsReadOnly", IsRequired = true)]
+    public bool SupportsReadOnly { get; set; }
+
     /// <inheritdoc />
     [IgnoreDataMember]
     public EditorType Type { get; }
diff --git a/src/Umbraco.Core/PropertyEditors/IDataEditor.cs b/src/Umbraco.Core/PropertyEditors/IDataEditor.cs
index 6f72f29cf3..0569f8ab9a 100644
--- a/src/Umbraco.Core/PropertyEditors/IDataEditor.cs
+++ b/src/Umbraco.Core/PropertyEditors/IDataEditor.cs
@@ -14,6 +14,8 @@ public interface IDataEditor : IDiscoverable
     /// </summary>
     string Alias { get; }
 
+    bool SupportsReadOnly => false;
+
     /// <summary>
     ///     Gets the type of the editor.
     /// </summary>
diff --git a/src/Umbraco.Infrastructure/PropertyEditors/TextboxPropertyEditor.cs b/src/Umbraco.Infrastructure/PropertyEditors/TextboxPropertyEditor.cs
index 5d160198c9..4f81bf410a 100644
--- a/src/Umbraco.Infrastructure/PropertyEditors/TextboxPropertyEditor.cs
+++ b/src/Umbraco.Infrastructure/PropertyEditors/TextboxPropertyEditor.cs
@@ -43,6 +43,7 @@ public class TextboxPropertyEditor : DataEditor
     {
         _ioHelper = ioHelper;
         _editorConfigurationParser = editorConfigurationParser;
+        SupportsReadOnly = true;
     }
 
     /// <inheritdoc />