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Advisory record · GHSA-gv94-wp4h-vv8p

Keycloak has Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

CVSS 5.3 MediumEPSS 0.0040 · 34th percentile

Published by the GitHub Advisory Database at 8 Jan 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-parentMaven<=26.5.0No fixed version yet
Identifiers
GHSA-gv94-wp4h-vv8p · CVE-2026-0707
Weakness (CWE)
CWE-551
Tags
Published
8 Jan 2026
Updated
9 Jun 2026

Machine-written summary

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

Keycloak (org.keycloak:keycloak-parent) versions up to and including 26.5.0 are affected. The Authorization header parser for the Bearer scheme accepts non-standard separators such as tabs and tolerates case variations that deviate from RFC 6750. The source gives few details on what an attacker can achieve with this. No fix is listed.

Written 3 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.