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 14.8% of all 326,604 vulnerabilities in our database.

#278,189

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	Summary	Published
CVE-2026-9791	🔶 medium	4.3	A flaw was found in Keycloak. An authenticated user with existing organization membership can exploit this flaw by acces...	2026-05-28
CVE-2026-9792	🔶 medium	6.5	A flaw was found in Keycloak's Client Policies, specifically within the `org.keycloak.protocol.oidc` component. When cer...	2026-05-28
CVE-2026-9793	🔶 medium	5.9	A flaw was found in Keycloak. When a JSON Web Encryption (JWE) encrypted request object is submitted, Keycloak may incor...	2026-05-28
CVE-2026-9794	🔶 medium	5.3	A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially cra...	2026-05-28
CVE-2026-9795	⚠️ high	7.3	A flaw was found in Keycloak's Fine-Grained Admin Permissions (FGAPv2) feature. An administrator with limited client man...	2026-05-28
CVE-2026-9796	🔶 medium	6.5	A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check ...	2026-05-28

These CVEs affect the same products