CVE-2026-37978 MEDIUM

CVE-2026-37978: Keycloak: org.keycloak.services: keycloak: information disclosure via evaluate-scopes admin api

Vendor Red Hat
Product Red Hat build of Keycloak 26.4.12
Weakness CWE-639 · IDOR
Published May 19, 2026
Last update May 20, 2026

CVSS base score

4.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 19, 2026 CVE published
May 20, 2026 Record updated