Headline
GHSA-v897-pv23-r8cw: Keycloak has an improper input validation vulnerability
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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- GitHub Advisory Database
- GitHub Reviewed
- CVE-2026-0976
Keycloak has an improper input validation vulnerability
Low severity GitHub Reviewed Published Jan 15, 2026 to the GitHub Advisory Database • Updated Jan 15, 2026
Package
maven org.keycloak:keycloak-quarkus-server (Maven)
Affected versions
<= 26.2.5
Description
Published to the GitHub Advisory Database
Jan 15, 2026
Last updated
Jan 15, 2026
EPSS score