CVE-2025-47949: samlify SAML Signature Wrapping attack

CVE-2025-47949 · Severity: medium · CVSS 4 · Published 2025-05-19

samlify is a Node.js library that handles SAML authentication, a common protocol for enterprise single sign-on. A signature wrapping attack in samlify allows attackers to forge SAML authentication responses and impersonate any user, provided they have access to a legitimate signed XML document from an identity provider. This could allow unauthorized access to applications relying on samlify for authentication.

Technologies: samlify (npm). Vendors: npm.

Quick answers

Is CVE-2025-47949 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-47949 being exploited in the wild.
How severe is CVE-2025-47949?
Medium severity, with a CVSS score of 4, published 19 May 2025.
Which products and versions are affected?
samlify (npm) SEMVER:introduced=0,fixed=2.10.0.
Is there a fix for CVE-2025-47949?
Yes. samlify (npm): upgrade to 2.10.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-47949 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2025-47949?
Check whether you run samlify (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • samlify (npm): upgrade to 2.10.0 or later
    npm install samlify@2.10.0

Technical details

A Signature Wrapping attack (CWE-347) has been identified in samlify versions prior to 2.10.0. The vulnerability allows an attacker to manipulate SAML response messages by wrapping signed XML elements in such a way that the signature validation logic is bypassed or misinterpreted. An attacker with access to a legitimately signed XML document from an identity provider can craft a forged SAML Response that authenticates as any user. The attack is network-reachable and requires no authentication or user interaction. The vulnerability has been patched in version 2.10.0 and later.

Affected products

  • samlify samlify < 2.10.0

Identifiers

  • CVE-2025-47949
  • GHSA-r683-v43c-6xqv

Timeline

  • 2025-05-19: disclosed
  • 2025-05-19: patched: patched in version 2.10.0

References

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