CVE-2026-4634
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Apr 02, 2026
Vendor
unknown
Description
A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.