High8.1Red Hat Linux

High [CVE-2026-11800] org.keycloak:keycloak-services: Keycloak: Authentication bypass via JWT algorithm confusion

This high-severity Red Hat Linux advisory covers CVE-2026-11800 affecting Red Hat build of Keycloak 26.6.

CVE-2026-11800 Published May 29, 2026

CVE-2026-11800

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

org.keycloak:keycloak-services: Keycloak: Authentication bypass via JWT algorithm confusion. Red Hat rates this important (CVSS 8.1).

Weakness: CWE-347. Affected package(s): rhbk/keycloak-rhel9:26.6, rhbk/keycloak-operator-bundle:26.6.4, rhbk/keycloak-rhel9-operator:26.6.

Resolved in Red Hat advisory RHSA-2026:30083 — update the affected packages (`sudo dnf update`).

Affected product named by the advisory: Red Hat build of Keycloak 26.6.

Affected versions

rhbk/keycloak-rhel9:26.6-8
rhbk/keycloak-operator-bundle:26.6.4-2
rhbk/keycloak-rhel9-operator:26.6-8

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:30083

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:30083 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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