CVE-2026-79652: Keycloak-services: keycloak-services: jwt bearer authorization grant does not enforce consentrequired

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-09-28
Weakness: CWE-862

Description

A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component of Red Hat Build of Keycloak. This component handles various OAuth2 and OpenID Connect grant types used for issuing access tokens. The issue occurs because the JWT Bearer grant fails to check if a client requires user consent before issuing a token. This allows an authenticated attacker with valid client credentials and a trusted identity provider assertion to bypass the consent requirement and obtain unauthorized access to a user account at a consent-gated client.

Affected products

Red Hat build of Keycloak 26.4: all versions — fixed in 26.6-20, 26.6.7-3

How to fix

Upgrade to a fixed version: Red Hat build of Keycloak 26.4 26.6-20, 26.6.7-3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-79652 or the next vulnerability affects your stack