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Vulnerabilities CVE-2026-16442

CVE-2026-16442

High
Open
TLP:CLEAR

Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction

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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.

Details

CVSS Score
7.4
EPSS Score
0.20%

10.3th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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