CVE-2025-54419 Node-SAML Contains SAML Signature Verification Vulnerability
Attackers can modify authentication details in valid SAML assertions by exploiting signature verification flaws, potentially leading to unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-54419?
CVE-2025-54419 is a critical authentication bypass vulnerability in node-saml, published on 28 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-54419?
6 open source packages ship an affected version, including @node-saml/node-saml, @node-saml/passport-saml and passport-saml.
| Package | Affected | Fixed in |
|---|---|---|
@node-saml/node-saml npm | All versions | 5.1.0 |
@node-saml/node-saml npm | All versions | 5.1.0 |
@node-saml/passport-saml npm | All versions | 5.1.0 |
@node-saml/passport-saml npm | All versions | 5.1.0 |
passport-saml npm | All versions to 3.2.4 | None |
passport-saml npm | All versions to 3.2.4 | None |
How do I fix CVE-2025-54419?
Upgrade @node-saml/node-saml to 5.1.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-54419 being exploited?
There is no known exploitation of CVE-2025-54419 in the wild and no public exploit code.
Sources
Also known as GHSA-4mxg-3p6v-xgq3.