Threat landscape
high

Keycloak: Mehrere Schwachstellen

WID-SEC-2026-2093 · first 26.06.2026 · updated 31.08.2026 · CVSS 8,1

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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 falsche Informationen darzustellen, um Informationen offenzulegen, um einen Cross-Site Scripting Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und um Dateien zu manipulieren.

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

  • falsche Informationen darzustellen
  • Informationen offenzulegen
  • einen Cross-Site Scripting Angriff durchzuführen
  • Sicherheitsvorkehrungen zu umgehen
  • Dateien zu manipulieren

Am I affected?

Affected according to the BSI:

  • Red Hat Enterprise Linux
  • Open Source Keycloak
  • Open Source Keycloak <26.7.3

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 26.7.3

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

CVE: CVE-2026-11800, CVE-2026-9083, CVE-2026-9086, CVE-2026-9099, CVE-2026-9705, CVE-2026-9799, CVE-2026-9800

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.

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