CVE-2026-0976
LOW3.7EPSS 0.01%Keycloak has an improper input validation vulnerability
Published: 1/15/2026Modified: 2/3/2026
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.
Affected packages (1)
- Maven/org.keycloak:keycloak-quarkus-serverfrom 0, <= 26.2.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |