CVE-2026-0976

Description

A flaw was found in Keycloak. This improper input validation vulnerability occurs because Keycloak accepts RFC-compliant matrix parameters in URL path segments, while common reverse proxy configurations may ignore or mishandle them. A remote attacker can craft requests to mask path segments, potentially bypassing proxy-level path filtering. This could expose administrative or sensitive endpoints that operators believe are not externally reachable.

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Produits concernés

• Red Hat build of Keycloak 26.4.9
• Red Hat Build of Keycloak
• Red Hat JBoss Enterprise Application Platform 8
• Red Hat JBoss Enterprise Application Platform Expansion Pack

Scores CVSS

Faiblesses (CWE)

• CWE-20

Références

• https://access.redhat.com/errata/RHSA-2026:2365
• https://access.redhat.com/security/cve/CVE-2026-0976
• https://bugzilla.redhat.com/show_bug.cgi?id=2429869

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories