Vulnerability Description
A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | >= 26.4, < 26.4.12 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:19596Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:19597Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-37981Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2455326Vendor Advisory
FAQ
What is CVE-2026-37981?
CVE-2026-37981 is a vulnerability with a CVSS score of 4.3 (MEDIUM). A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) re...
How severe is CVE-2026-37981?
CVE-2026-37981 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-37981?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.