CVE-2025-46573: passport-wsfed-saml2 Has SAML Authentication Bypass via Attribute Smuggling
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.
Classification
CVE ID: CVE-2025-46573
CVSS Base Severity: MEDIUM
CVSS Base Score: 4.6
CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Problem Types
CWE-287: Improper AuthenticationAffected Products
Vendor: auth0
Product: passport-wsfed-saml2
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.08% (probability of being exploited)
EPSS Percentile: 25.12% (scored less or equal to compared to others)
EPSS Date: 2025-06-04 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-46573https://github.com/auth0/passport-wsfed-saml2/security/advisories/GHSA-8gqj-226h-gm8r
https://github.com/auth0/passport-wsfed-saml2/commit/e5cf3cc2a53748207f7a81bfba9195c8efa94181