CVE-2026-37979
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedMay 19, 2026
First seenMay 19, 2026
How to fix
Update
- redhat build_of_keycloak26.4.12 or later
- org.keycloak:keycloak-services26.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.4 ≤ v < 26.4.12 | 26.4.12 |
| org.keycloak:keycloak-servicesMaven | v < 26.6.2 | 26.6.2 |
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