Improper Input Validation Affecting keycloak-advanced-compat package, versions <26.3.0-r0


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.35% (28th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-KEYCLOAKADVANCEDCOMPAT-15029042
  • published17 Jan 2026
  • disclosed15 Jan 2026

Introduced: 15 Jan 2026

CVE-2026-0976  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Minimos:latest keycloak-advanced-compat to version 26.3.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream keycloak-advanced-compat package and not the keycloak-advanced-compat package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1