CVE-2025-46573: auth0 passport-wsfed-saml2 Improper Authentication

Vulnerability summary

CVE-2025-46573 is a high (CVSS 8.6) Improper Authentication vulnerability in auth0 passport-wsfed-saml2. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.9% of scored vulnerabilities.

Timeline

1. 06-05-2025
   PublishedVulnerability first disclosed.
2. 07-05-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.