CVE-2026-2603 HIGH

CVE-2026-2603: Keycloak: keycloak: unauthorized authentication via disabled saml identity provider

Vendor Red Hat
Product Red Hat build of Keycloak 26.2.14
Weakness CWE-306 · Missing auth
Published March 18, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.

Key dates

02Disclosure timeline

March 18, 2026 CVE published
June 30, 2026 Record updated