Node-SAML SAML Authentication Bypass
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 upgraded xml-crypto to v6.1.2 and made sure to process the SAML assertions from only verified/authenticated contents. This will prevent future variants from coming up.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | node-saml | <= 3.1.2 | no fix |
| npm package | @node-saml/node-saml | < 5.1.0 | 5.1.0 |
References
- https://github.com/node-saml/node-saml/security/advisories/GHSA-m837-g268-mmv7
- https://nvd.nist.gov/vuln/detail/CVE-2025-54369
- https://github.com/node-saml/node-saml/commit/31ead9411ebc3e2385086fa9149b6c17732bca10
- https://github.com/node-saml/node-saml
- https://github.com/node-saml/node-saml/releases/tag/v5.1.0
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-287, CWE-347, CWE-87- Platform
- npm
- Package
node-saml, @node-saml/node-saml- Disclosed
- 25.07.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-m837-g268-mmv7 - CC BY 4.0
Vulnerability history: @node-saml/node-saml
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 10.2022 07.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 1
- Medium 1
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 2
- 2026: 0
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