Node-SAML SAML Signature Verification Vulnerability
Critical severity
GitHub Reviewed
Published
Jul 28, 2025
in
node-saml/node-saml
•
Updated Jul 30, 2025
Description
Published by the National Vulnerability Database
Jul 28, 2025
Published to the GitHub Advisory Database
Jul 28, 2025
Reviewed
Jul 28, 2025
Last updated
Jul 30, 2025
Node-SAML loads the assertion from the (unsigned) original response document. This is different than the parts that are verified when checking signature.
This allows an attacker to modify authentication details within a valid SAML assertion. For example, in one attack it is possible to remove any character from the SAML assertion username.
To conduct the attack an attacker would need a validly signed document from the identity provider (IdP).
In fixing this we made sure to process the SAML assertions from only verified/authenticated contents. This will prevent future variants from coming up.
Note: this is distinct from the previous xml-crypto CVEs.
References