CVE-2025-46573: Passport-wsfed-saml2 allows SAML Authentication Bypass via Attribute Smuggling

Overview

This vulnerability allows an attacker to impersonate any user during SAML authentication by tampering with a valid SAML response. This can be done by adding attributes to the response.

Am I Affected?

You are affected by this SAML Attribute Smuggling vulnerability if you are using passport-wsfed-saml2 version 4.6.3 or below, specifically under the following conditions:

1. The service provider is using passport-wsfed-saml2,
2. A valid SAML Response signed by the Identity Provider can be obtained

Fix

Upgrade to v4.6.4 or greater.