GHSA-rhgq-f8x5-j2jc
Keycloak's identity-first login flow exposes user information
At a glance
- Published
- Updated
- CVE
- CVE-2026-4633
- CVSS_V3
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Description
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-services | introduced 26.5.0, fixed 26.6.1 |
| Maven · org.keycloak:keycloak-services | introduced 0, fixed 26.4.12 |
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/errata/RHSA-2026:19596 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
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |