CVE-2026-37979
MEDIUM EPSS 28.5%
Published May 19, 20261mo ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Published May 19, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
28.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-284
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| redhat | build_of_keycloak | * | ≥26.4 – <26.4.12 |
References 4
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:19596
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:19597
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-37979
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2455328
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.