CVE-2026-4633

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.

Score

CVSS 3.1 3.7 Low

Status

Modified - secalert@redhat.com

Published

2026-03-23

Last modified

2026-10-22

Weaknesses

CWE-209

Affected products

• Build Keycloak (Redhat)
• Build Of Keycloak (Redhat)

References

• https://access.redhat.com/errata/RHSA-2026:19596
• https://access.redhat.com/security/cve/CVE-2026-4633
• https://bugzilla.redhat.com/show_bug.cgi?id=2450247