Riskcovery

CVE-2026-37979

Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass

State
Published
Severity
6.5 Medium
Published
May 19, 2026
Updated
Oct 29, 2026
Reserved
Apr 6, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.16.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nredhat

Weaknesses

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

Affected Products

ProductVersions
Red Hat build of Keycloak 26.4Red Hat
  • 26.4.12-1 and laterNot affected
Red Hat build of Keycloak 26.4Red Hat
  • 26.4-17 and laterNot affected
Red Hat build of Keycloak 26.4Red Hat
  • 26.4-17 and laterNot affected
Red Hat build of Keycloak 26.4.12Red Hat

    References

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