Keycloak 26.5.6 released

March 19 2026

To download the release go to Keycloak downloads.

Upgrading

Before upgrading refer to the migration guide for a complete list of changes.

#45645 CVE-2026-1180 - Blind Server-Side Request Forgery (SSRF) in Keycloak OIDC Dynamic Client Registration via jwks_uri oidc
#45647 CVE-2026-1035 - Keycloak Refresh Token Reuse Bypass via TOCTOU Race Condition oidc
#45650 CVE-2025-14777 - Keycloak IDOR in realm client creating/deleting
#45653 CVE-2025-14082 keycloak-server: Keycloak Admin REST API: Improper Access Control leads to sensitive role metadata information disclosure
#46719 CVE-2026-3121 - Keycloak: Privilege escalation via manage-clients permission
#46723 CVE-2026-3190 - Information Disclosure via improper role enforcement in UMA 2.0 Protection API core
#46922 CVE-2026-3911 Keycloak: Information disclosure of disabled user attributes via administrative endpoint user-profile
#47062 CVE-2026-2366 Authorization Bypass: Unprivileged tokens can enumerate user organization memberships organizations

#45889 Federated user disabled when external DB unavailable, never re-enabled storage
#46239 AUTH_SESSION_ID cookie reuse causes cross-user session contamination on re-authentication authentication
#46296 UsersResource.search briefRepresentation started to return user attributes admin/api
#46379 Unexpected error when logging out with offline session and external IDP oidc
#46459 Operator-built DB config: targetServerType=primary not applied / connection validation not working after master-replica failover (26.5.0) operator
#46588 Partial LDAP sync duration does not follow the defined value in user federation ldap
#46605 26.5.4 startup regression with many realms: RealmCacheSession.prepareCachedRealm() scans master admin role composites per realm (O(N²)) core
#46656 Em-Hyphens in SPI options on cache configuration page docs
#46663 JGroups bind port configuration ignored when --cache-embedded-network-bind-port set infinispan
#46669 SPIFFE Client assertion throws a NullPointerException if no client is found token-exchange
#47079 Do not allow fetching organizations of a member if not a member of the current organization organizations