diff --git a/app/auth/cas.py b/app/auth/cas.py
index 4b478eaf8c..2a037744a5 100644
--- a/app/auth/cas.py
+++ b/app/auth/cas.py
@@ -23,7 +23,8 @@ def after_cas_login():
     if ScoDocSiteConfig.is_cas_enabled() and ("CAS_ATTRIBUTES" in flask.session):
         # Lookup user:
         cas_id = flask.session["CAS_ATTRIBUTES"].get(
-            "cas:" + ScoDocSiteConfig.get("cas_attribute_id")
+            "cas:" + ScoDocSiteConfig.get("cas_attribute_id"),
+            flask.session.get("CAS_USERNAME"),
         )
         if cas_id is not None:
             user = User.query.filter_by(cas_id=cas_id).first()
diff --git a/app/auth/models.py b/app/auth/models.py
index c7ef016ddd..d39b02742b 100644
--- a/app/auth/models.py
+++ b/app/auth/models.py
@@ -546,18 +546,21 @@ class UserRole(db.Model):
         role_dept, of the forme "Role_Dept".
         role is a Role instance, dept is a string, or None.
         """
-        fields = role_dept.split("_", 1)  # maxsplit=1, le dept peut contenir un "_"
+        fields = role_dept.strip().split("_", 1)
+        # maxsplit=1, le dept peut contenir un "_"
         if len(fields) != 2:
             current_app.logger.warning(
                 f"role_dept_from_string:  Invalid role_dept '{role_dept}'"
             )
             raise ScoValueError("Invalid role_dept")
         role_name, dept = fields
+        dept = dept.strip() if dept else ""
         if dept == "":
             dept = None
+
         role = Role.query.filter_by(name=role_name).first()
         if role is None:
-            raise ScoValueError("role %s does not exists" % role_name)
+            raise ScoValueError(f"role {role_name} does not exists")
         return (role, dept)
 
 
diff --git a/app/forms/main/config_cas.py b/app/forms/main/config_cas.py
index 217b274f3a..ef8b84cf3c 100644
--- a/app/forms/main/config_cas.py
+++ b/app/forms/main/config_cas.py
@@ -44,7 +44,7 @@ class ConfigCASForm(FlaskForm):
     )
 
     cas_attribute_id = StringField(
-        label="Attribut CAS utilisé comme id",
+        label="Attribut CAS utilisé comme id (laissez vide pour prendre l'id par défaut)",
         description="""Le champs CAS qui sera considéré comme l'id unique des 
         comptes utilisateurs.""",
     )
diff --git a/sco_version.py b/sco_version.py
index b0481907fd..77a09ba3d1 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.4.52"
+SCOVERSION = "9.4.53"
 
 SCONAME = "ScoDoc"