High advisory for org
GHSA-j97h-3f8r-mrjr · Reported 3 Nov 2026
Full advisory details, affected packages, severity context, and original source.
Affected technology
Advisory overview
### Description A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
Affected packages and releases
Maven / org.keycloak:keycloak-services
1.0-alpha-1, 1.0-alpha-1-12062013, 1.0-alpha-2, 1.0-alpha-3, 1.0-alpha-4, 1.0-beta-1, 1.0-beta-1-20150521, 1.0-beta-1-20150523
Also known as
BIT-keycloak-2026-11800 · CVE-2026-11800