CVE-2026-37979
Keycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
8th
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.
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | May 19, 2026 |
| Last Updated | May 20, 2026 |
Stay Ahead of the Next One
Get instant alerts for red hat red hat build of keycloak 26.4
Be the first to know when new medium vulnerabilities affecting red hat red hat build of keycloak 26.4 are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
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
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.12
All versions affected References
Credits
Red Hat would like to thank Herdiyan Adam Putra for reporting this issue.