CVE-2026-37978
Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admin api
- State
- Published
- Severity
- 4.9 Medium
- Published
- May 19, 2026
- Updated
- May 20, 2026
- Reserved
- Apr 6, 2026
Description
A flaw was found in Keycloak. A low-privilege administrator with the 'view-clients' role can exploit this by invoking the 'evaluate-scopes' Admin API endpoints with an arbitrary user ID (userId) parameter. This vulnerability allows for cross-role personally identifiable information (PII) leakage, enabling unauthorized visibility into user identities and authorizations across the realm. Exploitation is possible remotely via network access to the Admin API.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.9 Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N | redhat |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4.12Red Hat |
References
- RHSA-2026:19596vendor-advisory
- RHSA-2026:19597vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-37978vdb-entry
- RHBZ#2455327issue-tracking
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