A flaw was found in the Keycloak LDAP User Federation provider. This vulnerability allows an authenticated realm administrator to trigger deserialization of untrusted Java objects via a malicious LDAP server configuration.
Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-4hx9-48xh-5mxr. This link is maintained to preserve external references. Original Description A flaw was found in the Keycloak LDAP User Federation provider. This vulnerability allows an authenticated realm administrator to trigger deserialization of untrusted Java objects via a malicious LDAP server configuration.
The issue arises because Keycloak does not perform an LDAP bind after a password reset, leading to potential authentication bypass for expired or disabled AD accounts. A fix should enforce LDAP validation after password updates to ensure consistency with AD authentication policies.
Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-2p82-5wwr-43cw. This link is maintained to preserve external references. Original Description A flaw was found in Keycloak. When an Active Directory user resets their password, the system updates it without performing an LDAP bind to validate the new credentials against AD. This vulnerability allows users whose AD accounts are expired or disabled to regain access in Keycloak, …
The LDAP testing endpoint allows to change the Connection URL independently of and without having to re-enter the currently configured LDAP bind credentials. An attacker with admin access (permission manage-realm) can change the LDAP host URL ("Connection URL") to a machine they control. The Keycloak server will connect to the attacker's host and try to authenticate with the configured credentials, thus leaking them to the attacker. As a consequence, an …
A flaw was found in the Keycloak package. This flaw allows an attacker to benefit from an LDAP query and access existing usernames in the server.