Threat landscape
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Keycloak: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

WID-SEC-2026-1573 · first 19.05.2026 · updated 14.10.2026 · CVSS 4,3

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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 Sicherheitsvorkehrungen zu umgehen.

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

  • Sicherheitsvorkehrungen zu umgehen

Am I affected?

Affected according to the BSI:

  • Red Hat Enterprise Linux
  • Open Source Keycloak
  • Open Source Keycloak <26.6.3
  • 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 26.6.3
  • 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

CVE: CVE-2026-8830

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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