CVE-2026-0976

LowCVSS 3.7/10Last modified Oct 22, 2026

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.

Metrics

CVSS 3.1 3.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
Red Hat	Red Hat build of Keycloak 26.4.9	—
Red Hat	Red Hat Build of Keycloak	—
Red Hat	Red Hat JBoss Enterprise Application Platform 8	—
Red Hat	Red Hat JBoss Enterprise Application Platform 8	—
Red Hat	Red Hat JBoss Enterprise Application Platform 8	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—
Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	—

References

Timeline

Published: Jan 15, 2026
Last modified: Oct 22, 2026
NVD status: Deferred

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