CVE-2026-37978

Medium

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.

SeverityMedium

CVSS4.9

Exploit probability—

Product

Redhat Build Of Keycloak

PublishedMay 19, 2026

First seenMay 19, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

redhat build_of_keycloak26.4.12 or later
org.keycloak:keycloak-services26.6.2 or later

Vendor advisories

Affected products

Product	Affected versions	Fixed in
redhat build_of_keycloak	v < 26.4.12	26.4.12
org.keycloak:keycloak-servicesMaven	v < 26.6.2	26.6.2

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