CVE-2026-37978

MediumCVSS 4.9/10Last modified Oct 25, 2026

Description

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.

Metrics

CVSS 3.1 4.9/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-639

Affected software

Vendor	Product	Versions
Red Hat	Red Hat build of Keycloak 26.4	—
Red Hat	Red Hat build of Keycloak 26.4	—
Red Hat	Red Hat build of Keycloak 26.4	—
Red Hat	Red Hat build of Keycloak 26.4.12	—

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

Timeline

Published: May 19, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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