CVE-2026-37981

MEDIUM

Keycloak: org.keycloak.authorization: keycloak: information disclosure via broken access control in user lookup endpoint

Title source: cna
STIX 2.1

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.

References (4)

Core 4
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:19596
https://access.redhat.com/errata/RHSA-2026:19596
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:19597
https://access.redhat.com/errata/RHSA-2026:19597
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-37981
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2455326
https://bugzilla.redhat.com/show_bug.cgi?id=2455326

Scores

CVSS v3 4.3
EPSS 0.0001
EPSS Percentile 1.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-1220
Status published
Products (4)
Red Hat/Red Hat Build of Keycloak
Red Hat/Red Hat build of Keycloak 26.4 26.4-17
Red Hat/Red Hat build of Keycloak 26.4 26.4.12-1
Red Hat/Red Hat build of Keycloak 26.4.12
Published May 19, 2026
Tracked Since May 19, 2026