GitHub Advisoryadvisory · Maven
GHSA-4x37-hw65-52w8 Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass
MEDIUM
Official page ↗
- Aliases
- CVE-2026-37979
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-services
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-284
- Reviewed
- 2026-06-04
Affected packages
• Maven org.keycloak:keycloak-services: < 26.6.2 → fixed in 26.6.2
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.
Related
Alias · CVE (1)
- CVE-2026-37979 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-284 Improper Access Control weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-37979 advisory
- https://github.com/keycloak/keycloak/issues/49113 web
- https://access.redhat.com/errata/RHSA-2026:19596 web
- https://access.redhat.com/errata/RHSA-2026:19597 web
- https://access.redhat.com/security/cve/CVE-2026-37979 web
- https://bugzilla.redhat.com/show_bug.cgi?id=2455328 web
- https://github.com/keycloak/keycloak package
- https://github.com/keycloak/keycloak/releases/tag/26.6.2 web