Keycloak: Mehrere Schwachstellen
WID-SEC-2026-0977 · first 07.04.2026 · updated 14.10.2026 · CVSS 8,1
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 einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Daten zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.
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
- einen Denial of Service Angriff durchzuführen
- Informationen offenzulegen
- Daten zu manipulieren
- Sicherheitsvorkehrungen zu umgehen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- Open Source Keycloak <26.5.7
- IBM Concert <3.0.1.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Keycloak 26.5.7
- IBM Concert 3.0.1.1
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)
- Keycloak 26.5.7 release notes vom 2026-04-06 www.keycloak.org
- Keycloak GitHub Issue 45569 vom 2026-04-06 github.com
- Keycloak GitHub Issue 47718 vom 2026-04-06 github.com
- GitHub Security Advisory GHSA-cjm2-j6cm-6p6m vom 2026-04-06 github.com
- Keycloak GitHub Issue 47719 vom 2026-04-06 github.com
- GitHub Security Advisory GHSA-hj93-h7pg-fh6v vom 2026-04-06 github.com
- Keycloak GitHub Issue 47715 vom 2026-04-06 github.com
- GitHub Security Advisory GHSA-rx66-hj7g-28h7 vom 2026-04-06 github.com
- Keycloak GitHub Issue 47716 vom 2026-04-06 github.com
- GitHub Security Advisory GHSA-h4wv-g838-66g3 vom 2026-04-06 github.com
- Keycloak GitHub Issue 47717 vom 2026-04-06 github.com
- GitHub Security Advisory GHSA-f2hx-5fx3-hmcv vom 2026-04-06 github.com
- Red Hat Security Advisory RHSA-2026:6477 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:6475 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:6476 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:6478 vom 2026-04-02 access.redhat.com
- Red Hat Security Advisory RHSA-2026:7380 vom 2026-04-15 access.redhat.com
- Red Hat Security Advisory RHSA-2026:25089 vom 2026-06-10 access.redhat.com
- IBM Security Bulletin 7292374 vom 2026-10-14 www.ibm.com
CVE: CVE-2026-1002, CVE-2026-3872, CVE-2026-4282, CVE-2026-4325, CVE-2026-4634, CVE-2026-4636
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.