CVE-2026-37978

🔶 medium

Summary

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.

CVSS Score

4.9

Medium

EPSS Score

0.0

Exploit Probability

Published Date

2026-05-19

First Seen: 2026-05-20

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 14.6% of all 342,933 vulnerabilities in our database.

#292,842

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 19, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2026-06-03

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-639

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
redhat	build_of_keycloak	Affected	< 26.4.12

🔗 References 4

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

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-18967	🔶 medium	6.4	0.1	A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured a...	2026-08-06
CVE-2026-16443	⚠️ high	7.4	0.1	A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine ...	2026-08-05
CVE-2026-15573	⚠️ high	8.1	0.3	A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security ...	2026-08-05
CVE-2026-16071	🔶 medium	5.4	0.2	A flaw was found in the LDAP storage provider of Keycloak, which is used to federate user identities from external direc...	2026-08-05
CVE-2026-16100	🔶 medium	6.5	0.3	A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error...	2026-08-05
CVE-2026-15572	⚠️ high	8.8	0.4	A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mappe...	2026-08-05

These CVEs affect the same products