VULNERABILITY INTELLIGENCE

CVE-2026-37979

CVSS score6.5 MEDIUM
EPSS probability0.37%
CISA KEVNot currently listed
Published2026-05-19
Last modified2026-10-29
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Description

A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect (OIDC) token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other resource servers, compromising the confidentiality of lightweight access tokens. This issue can be exploited remotely by any confidential client in the realm with valid credentials.

Weakness classification

  • CWE-284: Improper Access Control
  • CWE-639: Authorization Bypass Through User-Controlled Key

Primary references