---
title: "CVE-2025-47949: samlify SAML Signature Wrapping attack"
url: https://erroneo.us/security/cve/CVE-2025-47949/
description: "CVE-2025-47949 (samlify (npm)): samlify is a Node.js library for SAML single sign-on. A Signature Wrapping attack has been found in samlify prior to version…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-05-19
date_modified: 2025-05-20
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-47949"
kev: false
cvss: 9.9
epss: 0.00468
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-47949: samlify SAML Signature Wrapping attack

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 40: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 40% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes samlify (npm) < 2.10.0, fixed in 2.10.0 . Check your lockfile, including transitive dependencies.

## What it is

samlify is a Node.js library for SAML single sign-on. A Signature Wrapping attack has been found in samlify prior to version 2.10.0, allowing an attacker to forge a SAML Response to authenticate as any user. An attacker would need a signed XML document by the identity provider. Version 2.10.0 fixes the issue.

## Affected packages

- npm `samlify` < 2.10.0 → fixed: 2.10.0

## Affected products (CVE record)

- tngan samlify: < 2.10.0

## Severity

- GitHub_M CVSS 4.0: 9.9 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`
- GitHub CVSS 4.0: 9.9 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.47% probability of exploitation activity in the next 30 days; percentile 40.

## Sources

- [GitHub Advisory GHSA-r683-v43c-6xqv](https://github.com/advisories/GHSA-r683-v43c-6xqv)
- [CVE.org record CVE-2025-47949](https://www.cve.org/CVERecord?id=CVE-2025-47949)
- [NVD entry CVE-2025-47949](https://nvd.nist.gov/vuln/detail/CVE-2025-47949)
- [github.com](https://github.com/tngan/samlify/security/advisories/GHSA-r683-v43c-6xqv)
- [github.com](https://github.com/tngan/samlify/commit/115679acd89f0a37ea3ebd8fff7db54fca3e8af3)

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Source page: https://erroneo.us/security/cve/CVE-2025-47949/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt