GitHub Advisoryadvisory · Maven

GHSA-v897-pv23-r8cw Keycloak has an improper input validation vulnerability

LOW Published 2026-01-15 Modified 2026-10-23 Official page ↗
Aliases
CVE-2026-0976
Ecosystem
Maven
Packages
org.keycloak:keycloak-quarkus-server
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-20
Reviewed
2026-01-15

Affected packages

• Maven org.keycloak:keycloak-quarkus-server: <= 26.2.5 (no fix yet)

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.

Related

Alias · CVE (1)

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References