diff --git a/backend/igny8_core/api/authentication.py b/backend/igny8_core/api/authentication.py
index e3930a88..723abeef 100644
--- a/backend/igny8_core/api/authentication.py
+++ b/backend/igny8_core/api/authentication.py
@@ -62,16 +62,20 @@ class JWTAuthentication(BaseAuthentication):
                 # User not found - return None to allow other auth classes to try
                 return None
             
-            # Get account from token
+            # Get account from token (token's account_id is authoritative for current context)
             account_id = payload.get('account_id')
             account = None
             if account_id:
                 try:
                     account = Account.objects.get(id=account_id)
-                    # If user's account changed, use the new one from user object (most up-to-date)
-                    # This ensures we always use the user's current account, not a stale token account_id
-                    if user.account and user.account.id != account_id:
-                        account = user.account
+                    # Verify user has access to this account
+                    # For developers/admins, they can access any account
+                    # For regular users, verify they belong to this account
+                    if not user.is_admin_or_developer() and not user.is_system_account_user():
+                        # Regular user - must belong to this account
+                        if user.account and user.account.id != account_id:
+                            # User doesn't belong to token's account - use user's account instead
+                            account = user.account
                 except Account.DoesNotExist:
                     # Account from token doesn't exist - use user's account instead
                     pass
diff --git a/backend/igny8_core/auth/middleware.py b/backend/igny8_core/auth/middleware.py
index 1bcdd16f..5b82fb26 100644
--- a/backend/igny8_core/auth/middleware.py
+++ b/backend/igny8_core/auth/middleware.py
@@ -99,12 +99,20 @@ class AccountContextMiddleware(MiddlewareMixin):
                     user = User.objects.select_related('account', 'account__plan').get(id=user_id)
                     request.user = user
                     if account_id:
-                        # Verify account still exists and matches user
+                        # Verify account still exists
                         account = Account.objects.get(id=account_id)
-                        # If user's account changed, use the new one from user object
-                        if user.account and user.account.id != account_id:
-                            request.account = user.account
+                        # Token's account_id is authoritative for current context
+                        # For developers/admins, they can access any account
+                        # For regular users, verify they belong to this account
+                        if not user.is_admin_or_developer() and not user.is_system_account_user():
+                            # Regular user - must belong to this account
+                            if user.account and user.account.id != account_id:
+                                # User doesn't belong to token's account - use user's account instead
+                                request.account = user.account
+                            else:
+                                request.account = account
                         else:
+                            # Developer/admin/system user - use token's account (they can access any)
                             request.account = account
                     else:
                         try: