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.
Problem types
Insufficient Granularity of Access Control
Product status
26.4.12-1 (rpm) before *
26.4-17 (rpm) before *
26.4-17 (rpm) before *
Timeline
| 2026-04-06: | Reported to Red Hat. |
| 2026-05-19: | Made public. |
Credits
Red Hat would like to thank XavLimSG for reporting this issue.
References
access.redhat.com/errata/RHSA-2026:19596 (RHSA-2026:19596)
access.redhat.com/errata/RHSA-2026:19597 (RHSA-2026:19597)
access.redhat.com/security/cve/CVE-2026-37981
bugzilla.redhat.com/show_bug.cgi?id=2455326 (RHBZ#2455326)