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Advisory record · GHSA-rhgq-f8x5-j2jc

Keycloak's identity-first login flow exposes user information

CVSS 3.7 LowEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 23 Mar 2026, 12:30 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, <26.6.1 || <26.4.1226.6.1, 26.4.12
Identifiers
GHSA-rhgq-f8x5-j2jc · CVE-2026-4633
Weakness (CWE)
CWE-209
Tags
Published
23 Mar 2026
Updated
23 Oct 2026

Machine-written summary

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

Keycloak (org.keycloak:keycloak-services, rendered here as the Keycloak package) versions 26.5.0 up to but not including 26.6.1, and versions below 26.4.12, are affected. A remote attacker can use differing error messages in the identity-first login flow, when Organizations are enabled, to determine whether a user exists. Upgrade to version 26.6.1 or 26.4.12.

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
3.7 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 11 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.