GHSA-4x37-hw65-52w8
Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | org.keycloak:keycloak-services | < 26.6.2 | 26.6.2 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2026-37979
- https://github.com/keycloak/keycloak/issues/49113
- https://access.redhat.com/errata/RHSA-2026:19596
- https://access.redhat.com/errata/RHSA-2026:19597
- https://access.redhat.com/security/cve/CVE-2026-37979
- https://bugzilla.redhat.com/show_bug.cgi?id=2455328
- https://github.com/keycloak/keycloak
- https://github.com/keycloak/keycloak/releases/tag/26.6.2