GHSA-rhgq-f8x5-j2jc
Keycloak's identity-first login flow exposes user information
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.keycloak:keycloak-services | >= 26.5.0, < 26.6.1 | 26.6.1 |
| Maven | org.keycloak:keycloak-services | < 26.4.12 | 26.4.12 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-4633
- https://github.com/keycloak/keycloak/issues/47619
- https://github.com/keycloak/keycloak/pull/47635
- https://github.com/keycloak/keycloak/commit/b137016cc6dcfd9f59b2aa2e6d73af8b0ebf7c6e
- https://github.com/keycloak/keycloak/commit/b4558a874fa79341404ae4d2d8f240f22bfed340
- 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
- https://github.com/keycloak/keycloak