CyberICT

CVE-2026-16442

Redhat · Published August 5, 2026

CVSS v3.1

CRITICAL
Patch availableGet patch

Description

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

Affected Products

  • Build OF Keycloak < 26.4.14
  • Build OF Keycloak < 26.6.5

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H