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Vulnerabilities CVE-2026-0976

CVE-2026-0976

Low
Open
TLP:CLEAR

Org.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of matrix parameters in url paths

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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.

Details

CVSS Score
3.7
EPSS Score
0.35%

28.3th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Confidence
90%
Published
Jan 15, 2026
Last Modified
Aug 9, 2026
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