Keycloak's identity-first login flow exposes user information
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.
01
describes (1)
Related CVEs.
| ID | severity | exploitable |
|---|---|---|
| CVE-2026-4633US | low | — |
02
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-4633WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2450247WEB
- https://github.com/keycloak/keycloakPACKAGE
- https://github.com/keycloak/keycloak/commit/b137016cc6dcfd9f59b2aa2e6d73af8b0ebf7c6eWEB
- https://github.com/keycloak/keycloak/commit/b4558a874fa79341404ae4d2d8f240f22bfed340WEB
- https://github.com/keycloak/keycloak/issues/47619WEB
- https://github.com/keycloak/keycloak/pull/47635WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-4633ADVISORY
scry
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan