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Advisory record · GHSA-m32f-8vh9-2hh3

Keycloak: Arbitrary code execution via Stored Cross-Site Scripting (XSS) in organization selection login page

CVSS 6.9 MediumEPSS 0.0036 · 29th percentile

Published by the GitHub Advisory Database at 14 Apr 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<=26.5.5No fixed version yet
Identifiers
GHSA-m32f-8vh9-2hh3 · CVE-2026-37980
Weakness (CWE)
CWE-79
Tags
Published
14 Apr 2026
Updated
22 Oct 2026

Machine-written summary

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

Keycloak keycloak-services versions up to and including 26.5.5 are affected. An attacker needs a Keycloak account with manage-realm or manage-organizations administrative privileges to store a crafted organization alias, which runs as JavaScript in the browser of users who view the organization selection login page. This could allow session theft or unauthorized actions against users of the realm. 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
6.9 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0036, the 29th percentile, on 10 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.