Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-22rm-wp4x-v5cx

Keycloak Server-Side Request Forgery via OIDC token endpoint manipulation

CVSS 3.1 LowEPSS 0.0035 · 29th percentile

Published by the GitHub Advisory Database at 26 Mar 2026, 09:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven>=26.5.0, <26.6.3 || <26.4.1326.6.3, 26.4.13
Identifiers
GHSA-22rm-wp4x-v5cx · CVE-2026-4874
Weakness (CWE)
CWE-918
Tags
Published
26 Mar 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, Maven) versions 26.5.0 up to but not including 26.6.3, and versions below 26.4.13, are affected. An authenticated attacker can manipulate the client_session_host parameter during refresh token requests, but only when a client uses the backchannel logout URL with the application session host placeholder. This can make the Keycloak server send HTTP requests into its own network, which may expose internal services and lead to information disclosure. Upgrade to version 26.6.3 or 26.4.13.

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
3.1 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 29th percentile, on 11 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.