Keycloak (admin-ui-ext): Schwachstelle ermöglicht Manipulation von Dateien
WID-SEC-2026-1894 · first 12.06.2026 · updated 06.08.2026 · CVSS 4,9
What it is about
Keycloak ermöglicht Single Sign-On mit Identity and Access Management für moderne Anwendungen und Dienste. Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um Dateien zu manipulieren.
Under what conditions?
Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.
What can happen in the worst case
An attacker could use the vulnerability to
- Dateien zu manipulieren
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- Open Source Keycloak
- Open Source Keycloak <26.7.0
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 26.7.0
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)
- Red Hat Bugtracker 2487906 vom 2026-06-11 bugzilla.redhat.com
- Keycloak 26.7.0 release vom 2026-07-09 www.keycloak.org
- Red Hat Security Advisory RHSA-2026:50848 vom 2026-08-05 access.redhat.com
- Red Hat Security Advisory RHSA-2026:50849 vom 2026-08-05 access.redhat.com
CVE: CVE-2026-11986
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.