Authorization Bypass Through User-Controlled Key Affecting org.keycloak:keycloak-services package, versions [,26.6.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 May 2026
- disclosed19 May 2026
- creditUnknown
Introduced: 19 May 2026
CVE-2026-37978 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-services to version 26.6.2 or higher.
Overview
org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services.
Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the generateAccessToken path in ClientScopeEvaluateResource.java. An attacker can generate client scope tokens for a user by supplying that user’s ID to client scope evaluation without having permission to view the user. The vulnerable flow resolves the target user and proceeds to generate a token without enforcing a user access check, allowing callers with client-scope evaluation access to act on users they are not authorized to inspect. This exposes user-related token data, allowing unauthorized administrators or users with low administrative privileges to evaluate scopes against arbitrary users.
Note: While the fix was back-ported to version 26.4.12, this version has not been published to Maven Central.