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Advisory record · GHSA-f2hx-5fx3-hmcv

Keycloak: UMA Policy Resource Injection Allows Unauthorized Cross-User Permission Grants

CVSS 8.1 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 2 Apr 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.5.726.5.7
Identifiers
GHSA-f2hx-5fx3-hmcv · BIT-keycloak-2026-4636 · CVE-2026-4636
Weakness (CWE)
CWE-551
Tags
Published
2 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

Keycloak keycloak-services versions before 26.5.7 are vulnerable. An authenticated user with the uma_protection role can include resource identifiers owned by other users in a UMA policy creation request, gaining permissions to victim-owned resources and the ability to obtain tokens that access sensitive information or perform unauthorized actions. Upgrade to keycloak-services 26.5.7.

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
8.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 5 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.