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Advisory record · GHSA-c739-f6xw-6pv2

Keycloak Protection API allows authenticated clients to access and modify resources owned by other Resource Servers

CVSS 6.8 MediumEPSS 0.0030 · 23rd percentile

Published by the GitHub Advisory Database at 19 May 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.6.226.6.2
Identifiers
GHSA-c739-f6xw-6pv2 · BIT-keycloak-2026-4630 · CVE-2026-4630
Weakness (CWE)
CWE-639
Tags
Published
19 May 2026
Updated
26 Aug 2026

Machine-written summary

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

Keycloak's keycloak-services Maven package, versions before 26.6.2, is affected. An authenticated client that knows or obtains the UUID of a resource belonging to another Resource Server in the same realm can bypass authorization checks in the Protection API and read, modify, or delete that resource. Upgrade to version 26.6.2 or later.

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
6.8 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0030, the 23rd percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.