CVE-2026-16442

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

05/08/2026

Last modified:

10/08/2026

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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 7.40 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): None

Base Score 3.x

7.40

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:redhat:build_of_keycloak::::::::	26.4 (including)	26.4.14 (excluding)
cpe:2.3:a:redhat:build_of_keycloak::::::::	26.6 (including)	26.6.5 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-16442

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools