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Advisory record · GHSA-v897-pv23-r8cw

Keycloak has an improper input validation vulnerability

CVSS 3.7 LowEPSS 0.0049 · 42nd percentile

Published by the GitHub Advisory Database at 15 Jan 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-quarkus-serverMaven<=26.2.5No fixed version yet
Identifiers
GHSA-v897-pv23-r8cw · CVE-2026-0976
Weakness (CWE)
CWE-20
Tags
Published
15 Jan 2026
Updated
23 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Keycloak's keycloak-quarkus-server package, versions up to and including 26.2.5, accepts RFC-compliant matrix parameters in URL path segments. A remote attacker can craft requests that reverse proxies may mishandle, potentially bypassing proxy-level path filtering and reaching administrative or sensitive endpoints. No fix is listed.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.7 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 42nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.