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Advisory record · GHSA-v38p-mqq3-m6v5

Keycloak Reflected XSS

CVSS 5.4 MediumEPSS 0.010 · 63rd percentile

Published by the GitHub Advisory Database at 13 May 2022, 01:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-parentMaven<3.4.03.4.0
Identifiers
GHSA-v38p-mqq3-m6v5 · CVE-2017-12158
Weakness (CWE)
CWE-79 · CWE-444
Tags
Published
13 May 2022
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-parent, Maven) versions before 3.4.0 are vulnerable. The source says Keycloak accepted a HOST header URL in the admin console and used it to determine web resource locations, so an attacker could cause reflected cross-site scripting against an authenticated user via a malicious server. Upgrade to version 3.4.0 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
5.4 Medium 3.0 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.010, the 63rd percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:18 UTC First seen by agentprime
  2. 31 Oct 2026, 14:18 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.