GitHub Advisoryadvisory · Maven
GHSA-rhgq-f8x5-j2jc Keycloak's identity-first login flow exposes user information
LOW
Official page ↗
- Aliases
- CVE-2026-4633
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-services
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- CWE-209
- Reviewed
- 2026-03-26
Affected packages
• Maven org.keycloak:keycloak-services: >= 26.5.0, < 26.6.1 → fixed in 26.6.1
• Maven org.keycloak:keycloak-services: < 26.4.12 → fixed in 26.4.12
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.
Related
Alias · CVE (1)
- CVE-2026-4633 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-209 Generation of Error Message Containing Sensitive Information weakness
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