auth0 passport-wsfed-saml2 up to 4.6.3 SAML2 Authentication improper authentication

Summaryinfo

A vulnerability marked as critical has been reported in auth0 passport-wsfed-saml2 up to 4.6.3. Impacted is an unknown function of the component SAML2 Authentication. This manipulation causes improper authentication. This vulnerability is registered as CVE-2025-46572. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in auth0 passport-wsfed-saml2 up to 4.6.3. Affected by this vulnerability is an unknown code of the component SAML2 Authentication. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 in the Auth0 tenant during SAML authentication by crafting a SAMLResponse. This can be done by using a valid SAML object that was signed by the configured IdP. Users are affected specifically when the service provider is using passport-wsfed-saml2 and a valid SAML document signed by the Identity Provider can be obtained. Version 4.6.4 contains a fix for the vulnerability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-46572 since 04/24/2025. The exploitation appears to be difficult. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 4.6.4 eliminates this vulnerability. Applying the patch e5cf3cc2a53748207f7a81bfba9195c8efa94181 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• auth0

Name

• passport-wsfed-saml2

Version

• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3

License

• open-source

Website

• Product: https://github.com/auth0/passport-wsfed-saml2/

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