VULNERABILITY INTELLIGENCE

CVE-2026-4634

CVSS score7.5 HIGH
EPSS probability0.64%
CISA KEVNot currently listed
Published2026-04-02
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • secalert@redhat.com: CWE-1050
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-1050

Primary references