A flaw was found in Keycloak
A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.
CVSS Score
8.1
HIGH
Published
16 Jul 2026 01:16
Modified
09 Aug 2026 15:10
Vendor
Redhat
Product
Build Of Keycloak
Source
CIRCL
CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Complexity
Low
Privileges
Low
Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Weaknesses (CWE)
CWE-284
Affected Systems
Redhat
Build Of Keycloak
Redhat
Build Of Keycloak
External Links
KEV Status
Not in CISA KEV catalog