CVE-2026-37978

4.9 MEDIUM

A flaw was found in Keycloak

Published: 2026-05-19 · Last updated: 2026-06-03

Severity and scoring

CVSS: 4.9 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE: CWE-639

Affected products

Vendor	Product
redhat	build_of_keycloak

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-37978
[Vendor advisory]https://access.redhat.com/errata/RHSA-2026:19596
[Vendor advisory]https://access.redhat.com/errata/RHSA-2026:19597
[Vendor advisory]https://access.redhat.com/security/cve/CVE-2026-37978
[Vendor advisory]https://bugzilla.redhat.com/show_bug.cgi?id=2455327

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