CVE-2025-54419

Description

A SAML library not dependent on any frameworks that runs in Node. In version 5.0.1, 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). This is fixed in version 5.1.0.

CVSS v3.1 Score

10.0

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Weakness Type (CWE)

CWE-287 Improper Authentication

CWE-347 CWE-347

References

Other References

https://github.com/node-saml/node-saml/commit/31ead9411ebc3e2385086fa9149b6c17732bca10 https://github.com/node-saml/node-saml/releases/tag/v5.1.0 https://github.com/node-saml/node-saml/security/advisories/GHSA-4mxg-3p6v-xgq3

Frequently Asked Questions

What is CVE-2025-54419? +

A SAML library not dependent on any frameworks that runs in Node. In version 5.0.1, 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). This is fixed in version 5.1.0. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-54419? +

CVE-2025-54419 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

How do I check if I'm vulnerable to CVE-2025-54419? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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