Medium 6.5Published May 19, 2026

CVE-2026-37979Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass

Updated under an hour ago (Oct 26, 2026, 9:50 AM ET)

Does this affect you?

It affects Red Hat build of Keycloak 26.4 and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Red Hat build of Keycloak 26.4

Exploited in the last 30 days

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: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: May 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak	from 26.4.12-1 not affected	CNA record
redhat build_of_keycloak redhat:build_of_keycloak	from 26.4 before 26.4.12	NVD

References

https://access.redhat.com/errata/RHSA-2026:19596vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:19597vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-37979vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455328issue-tracking, x-refsource-redhat, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.