Auth bypass in Node-Saml
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.
Vulnerability class: Broken Authentication
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
Affected products
- Node-saml — versions = 5.0.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-54419?
- CVE-2025-54419 is a critical-severity vulnerability in Node-Saml, classified under Improper Authentication. CVSS score: 10.0/10. Published 2025-07-28.
- How severe is CVE-2025-54419?
- Critical severity. CVSS v3 base score is 10.0 out of 10.