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Advisory record · GHSA-p3v8-fm5p-v84h

Keycloak has an Improper Verification of Cryptographic Signature issue

CVSS 5.9 MediumEPSS 0.0016 · 5th percentile

Published by the GitHub Advisory Database at 28 May 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<=26.6.4No fixed version yet
Identifiers
GHSA-p3v8-fm5p-v84h · CVE-2026-9793
Weakness (CWE)
CWE-347
Tags
Published
28 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Keycloak (org.keycloak:keycloak-services, versions up to and including 26.6.4) may accept unsigned claims in JWE-encrypted request objects when the decrypted content is raw JSON, bypassing the configured signature policy. A remote attacker can submit unauthorized claims, compromising data integrity in the OpenID Connect authorization flow. No fixed version 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
5.9 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0016, the 5th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.