Is CVE-2026-37978 actively exploited?

No active exploitation of CVE-2026-37978 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-37978 be exploited remotely?

Yes. CVE-2026-37978 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-37978?

CVE-2026-37978 has a CVSS score of 4.9 (MEDIUM).

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MEDIUM

CVE-2026-37978

CWE-639Published: May 19, 2026· Updated: May 20, 2026

4.9

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-37978 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.9.