CVE-2026-4633
Keycloak: keycloak: user enumeration via differential error messages
- State
- Published
- Severity
- 3.7 Low
- Published
- Mar 23, 2026
- Updated
- Oct 22, 2026
- Reserved
- Mar 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | redhat |
Weaknesses
- CWE-209 Generation of Error Message Containing Sensitive Information
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.4.12Red Hat | |
Red Hat Build of KeycloakRed Hat |
References
- RHSA-2026:19596vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-4633vdb-entry
- RHBZ#2450247issue-tracking
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.