CVE-2025-54369: Node-SAML SAML Authentication Bypass

Severity: critical (CVSS 9.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-24 · updated 2026-06-17
Weakness: CWE-87

Description

Node-SAML is a SAML library not dependent on any frameworks that runs in Node. In versions 5.0.1 and below, 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. This issue is fixed in version 5.1.0.

Affected products

node-saml: before 5.1.0

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-m837-g268-mmv7

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