CVE-2026-37979
Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass
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.
How to fix CVE-2026-37979
To remediate CVE-2026-37979, upgrade the affected package to a fixed version below.
- —upgrade to 26.6.2 or later
Is CVE-2026-37979 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-37979.
Affected packages (1)
- from 0, < 26.6.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |