Keycloak: Mehrere Schwachstellen
WID-SEC-2026-4191 · first 28.10.2026 · updated 30.10.2026 · CVSS 9,1
What it is about
Keycloak ermöglicht Single Sign-On mit Identity and Access Management für moderne Anwendungen und Dienste. Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren und vertrauliche Informationen offenzulegen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- Sicherheitsvorkehrungen zu umgehen
- Daten zu manipulieren
- vertrauliche Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Open Source Keycloak
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
According to the BSI there is no update yet. The vendor notices below name interim protective measures, if any.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Red Hat Bugtracker 2561959 vom 2026-10-27 bugzilla.redhat.com
- Red Hat Bugtracker 2561961 vom 2026-10-27 bugzilla.redhat.com
- Red Hat Bugtracker 2561991 vom 2026-10-27 bugzilla.redhat.com
- Red Hat Bugtracker 2562005 vom 2026-10-27 bugzilla.redhat.com
- Red Hat Bugtracker 2562575 vom 2026-10-27 bugzilla.redhat.com
CVE: CVE-2026-117627, CVE-2026-117688, CVE-2026-117859, CVE-2026-118030, CVE-2026-118425
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.