Keycloak: Mehrere Schwachstellen
WID-SEC-2026-2915 · first 19.08.2026 · updated 01.10.2026 · 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 und dadurch Benutzerkonten zu übernehmen.
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
- dadurch Benutzerkonten zu übernehmen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- Red Hat Enterprise Linux Keycloak
- Open Source Keycloak <26.7.2
- Siemens Industrial Edge Management <V1.15.20
- Siemens Industrial Edge Management <V2.2.2
- Siemens Industrial Edge Management virtual <V2.9.1
- Open Source Keycloak <26.8.0
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 26.7.2
- Siemens Industrial Edge Management V1.15.20
- Siemens Industrial Edge Management V2.2.2
- Siemens Industrial Edge Management virtual V2.9.1
- Open Source Keycloak 26.8.0
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 26.7.2 release vom 2026-08-18 www.keycloak.org
- Red Hat Security Advisory RHSA-2026:56524 vom 2026-08-18 access.redhat.com
- Red Hat Security Advisory RHSA-2026:56523 vom 2026-08-19 access.redhat.com
- Red Hat Security Advisory RHSA-2026:56520 vom 2026-08-18 access.redhat.com
- Red Hat Security Advisory RHSA-2026:56519 vom 2026-08-19 access.redhat.com
- PoC CVE-2026-18963 vom 2026-08-24 github.com
- Siemens Security Advisory SSA-503852 vom 2026-09-08 cert-portal.siemens.com
- Keycloak 26.8.0 released vom 2026-10-01 www.keycloak.org
CVE: CVE-2026-15571, CVE-2026-18963, CVE-2026-45292, CVE-2026-59888, CVE-2026-59889
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.