CVE-2025-46573: AUTH0 Passport-Wsfed-SAML2

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

passport-wsfed-saml2 provides passport strategy for both WS-fed and SAML2 protocol. A vulnerability present starting in version 3.0.5 up to and including version 4.6.3 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. Users are affected specifically when the service provider is using `passport-wsfed-saml2` and a valid SAML Response signed by the Identity Provider can be obtained. Version 4.6.4 contains a fix for the vulnerability.

Affected products

• AUTH0 Passport-Wsfed-SAML2: from 3.0.5, before 4.6.4 (fixed in 4.6.4)

Published 2025-05-06. Last modified 2026-06-17.