LOW3.7

GHSA-rhgq-f8x5-j2jc

Keycloak's identity-first login flow exposes user information

Quick fix

GHSA-rhgq-f8x5-j2jc — org.keycloak:keycloak-services: upgrade to the fixed version with the command below.

# pom.xml: bump <version>26.6.1</version> for org.keycloak:keycloak-services

Details

A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.

Are you affected?

Enter the version of the package you're using.

Affected packages

Maven/org.keycloak:keycloak-services

Introduced in: 26.5.0Fixed in: 26.6.1

Fix# pom.xml: bump <version>26.6.1</version> for org.keycloak:keycloak-services

Maven/org.keycloak:keycloak-services

Introduced in: 0Fixed in: 26.4.12

Fix# pom.xml: bump <version>26.4.12</version> for org.keycloak:keycloak-services

References

https://nvd.nist.gov/vuln/detail/CVE-2026-4633[ADVISORY]
https://github.com/keycloak/keycloak/issues/47619[WEB]
https://github.com/keycloak/keycloak/pull/47635[WEB]
https://github.com/keycloak/keycloak/commit/b137016cc6dcfd9f59b2aa2e6d73af8b0ebf7c6e[WEB]
https://github.com/keycloak/keycloak/commit/b4558a874fa79341404ae4d2d8f240f22bfed340[WEB]
https://access.redhat.com/security/cve/CVE-2026-4633[WEB]
https://bugzilla.redhat.com/show_bug.cgi?id=2450247[WEB]
https://github.com/keycloak/keycloak[PACKAGE]