diff --git a/schema.graphql b/schema.graphql
index e5ad39d..6627ebd 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -78,6 +78,7 @@ type AttributeSchema {
   isVisible: Boolean!
   isEditable: Boolean!
   isHardcoded: Boolean!
+  isReadonly: Boolean!
 }
 
 "The fields that can be updated for a user."
diff --git a/server/src/domain/handler.rs b/server/src/domain/handler.rs
index c5d5ad3..21a9796 100644
--- a/server/src/domain/handler.rs
+++ b/server/src/domain/handler.rs
@@ -147,6 +147,7 @@ pub struct AttributeSchema {
     pub is_visible: bool,
     pub is_editable: bool,
     pub is_hardcoded: bool,
+    pub is_readonly: bool,
 }
 
 #[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)]
diff --git a/server/src/domain/model/group_attribute_schema.rs b/server/src/domain/model/group_attribute_schema.rs
index 2c33ef1..4529185 100644
--- a/server/src/domain/model/group_attribute_schema.rs
+++ b/server/src/domain/model/group_attribute_schema.rs
@@ -50,6 +50,7 @@ impl From<Model> for AttributeSchema {
             is_visible: value.is_group_visible,
             is_editable: value.is_group_editable,
             is_hardcoded: value.is_hardcoded,
+            is_readonly: false,
         }
     }
 }
diff --git a/server/src/domain/model/user_attribute_schema.rs b/server/src/domain/model/user_attribute_schema.rs
index aa4dbb8..434840e 100644
--- a/server/src/domain/model/user_attribute_schema.rs
+++ b/server/src/domain/model/user_attribute_schema.rs
@@ -50,6 +50,7 @@ impl From<Model> for AttributeSchema {
             is_visible: value.is_user_visible,
             is_editable: value.is_user_editable,
             is_hardcoded: value.is_hardcoded,
+            is_readonly: false,
         }
     }
 }
diff --git a/server/src/domain/schema.rs b/server/src/domain/schema.rs
index 665bc87..8aad05c 100644
--- a/server/src/domain/schema.rs
+++ b/server/src/domain/schema.rs
@@ -43,6 +43,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "creation_date".into(),
@@ -51,6 +52,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "mail".into(),
@@ -59,6 +61,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: true,
                 is_hardcoded: true,
+                is_readonly: false,
             },
             AttributeSchema {
                 name: "uuid".into(),
@@ -67,6 +70,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "display_name".into(),
@@ -75,6 +79,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: true,
                 is_hardcoded: true,
+                is_readonly: false,
             },
         ]);
         schema
@@ -89,6 +94,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "creation_date".into(),
@@ -97,6 +103,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "uuid".into(),
@@ -105,6 +112,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: false,
                 is_hardcoded: true,
+                is_readonly: true,
             },
             AttributeSchema {
                 name: "display_name".into(),
@@ -113,6 +121,7 @@ impl From<Schema> for PublicSchema {
                 is_visible: true,
                 is_editable: true,
                 is_hardcoded: true,
+                is_readonly: false,
             },
         ]);
         schema
diff --git a/server/src/domain/sql_schema_backend_handler.rs b/server/src/domain/sql_schema_backend_handler.rs
index 288055a..bea2fbd 100644
--- a/server/src/domain/sql_schema_backend_handler.rs
+++ b/server/src/domain/sql_schema_backend_handler.rs
@@ -196,6 +196,7 @@ mod tests {
                             is_visible: true,
                             is_editable: true,
                             is_hardcoded: true,
+                            is_readonly: false,
                         },
                         AttributeSchema {
                             name: "first_name".into(),
@@ -204,6 +205,7 @@ mod tests {
                             is_visible: true,
                             is_editable: true,
                             is_hardcoded: true,
+                            is_readonly: false,
                         },
                         AttributeSchema {
                             name: "last_name".into(),
@@ -212,6 +214,7 @@ mod tests {
                             is_visible: true,
                             is_editable: true,
                             is_hardcoded: true,
+                            is_readonly: false,
                         }
                     ]
                 },
@@ -246,6 +249,7 @@ mod tests {
             is_visible: false,
             is_editable: false,
             is_hardcoded: false,
+            is_readonly: false,
         };
         assert!(fixture
             .handler
@@ -329,6 +333,7 @@ mod tests {
             is_visible: true,
             is_editable: false,
             is_hardcoded: false,
+            is_readonly: false,
         };
         assert!(fixture
             .handler
diff --git a/server/src/infra/graphql/mutation.rs b/server/src/infra/graphql/mutation.rs
index b0249c5..f8d414a 100644
--- a/server/src/infra/graphql/mutation.rs
+++ b/server/src/infra/graphql/mutation.rs
@@ -609,6 +609,13 @@ fn deserialize_attribute(
     let attribute_schema = attribute_schema
         .get_attribute_schema(&attribute_name)
         .ok_or_else(|| anyhow!("Attribute {} is not defined in the schema", attribute.name))?;
+    if attribute_schema.is_readonly {
+        return Err(anyhow!(
+            "Permission denied: Attribute {} is read-only",
+            attribute.name
+        )
+        .into());
+    }
     if !is_admin && !attribute_schema.is_editable {
         return Err(anyhow!(
             "Permission denied: Attribute {} is not editable by regular users",
diff --git a/server/src/infra/graphql/query.rs b/server/src/infra/graphql/query.rs
index 5332d70..19d8b97 100644
--- a/server/src/infra/graphql/query.rs
+++ b/server/src/infra/graphql/query.rs
@@ -498,6 +498,9 @@ impl<Handler: BackendHandler> AttributeSchema<Handler> {
     fn is_hardcoded(&self) -> bool {
         self.schema.is_hardcoded
     }
+    fn is_readonly(&self) -> bool {
+        self.schema.is_readonly
+    }
 }
 
 impl<Handler: BackendHandler> Clone for AttributeSchema<Handler> {
@@ -745,6 +748,7 @@ mod tests {
                             is_visible: true,
                             is_editable: true,
                             is_hardcoded: true,
+                            is_readonly: false,
                         },
                         DomainAttributeSchema {
                             name: "last_name".into(),
@@ -753,6 +757,7 @@ mod tests {
                             is_visible: true,
                             is_editable: true,
                             is_hardcoded: true,
+                            is_readonly: false,
                         },
                     ],
                 },
@@ -764,6 +769,7 @@ mod tests {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: false,
+                        is_readonly: false,
                     }],
                 },
                 extra_user_object_classes: vec![
@@ -1125,13 +1131,14 @@ mod tests {
         mock.expect_get_schema().times(1).return_once(|| {
             Ok(crate::domain::handler::Schema {
                 user_attributes: AttributeList {
-                    attributes: vec![crate::domain::handler::AttributeSchema {
+                    attributes: vec![DomainAttributeSchema {
                         name: "invisible".into(),
                         attribute_type: AttributeType::JpegPhoto,
                         is_list: false,
                         is_visible: false,
                         is_editable: true,
                         is_hardcoded: true,
+                        is_readonly: false,
                     }],
                 },
                 group_attributes: AttributeList {
diff --git a/server/src/infra/ldap_handler.rs b/server/src/infra/ldap_handler.rs
index 42d2234..f2729a7 100644
--- a/server/src/infra/ldap_handler.rs
+++ b/server/src/infra/ldap_handler.rs
@@ -2884,6 +2884,7 @@ mod tests {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: false,
+                        is_readonly: false,
                     }],
                 },
                 group_attributes: AttributeList {
@@ -2894,6 +2895,7 @@ mod tests {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: false,
+                        is_readonly: false,
                     }],
                 },
                 extra_user_object_classes: vec![
diff --git a/server/src/infra/test_utils.rs b/server/src/infra/test_utils.rs
index 1beb7c1..b908111 100644
--- a/server/src/infra/test_utils.rs
+++ b/server/src/infra/test_utils.rs
@@ -84,6 +84,7 @@ pub fn setup_default_schema(mock: &mut MockTestBackendHandler) {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: true,
+                        is_readonly: false,
                     },
                     AttributeSchema {
                         name: "first_name".into(),
@@ -92,6 +93,7 @@ pub fn setup_default_schema(mock: &mut MockTestBackendHandler) {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: true,
+                        is_readonly: false,
                     },
                     AttributeSchema {
                         name: "last_name".into(),
@@ -100,6 +102,7 @@ pub fn setup_default_schema(mock: &mut MockTestBackendHandler) {
                         is_visible: true,
                         is_editable: true,
                         is_hardcoded: true,
+                        is_readonly: false,
                     },
                 ],
             },