CVE-2026-37978

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.

• CWE-639

• 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-2026-37978Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2455327Vendor Advisory

Published

May 19, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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