Security Digest · Vulnerability record
CVE-2025-47949: samlify SAML Signature Wrapping attack
samlify is a Node.js library for SAML single sign-on.
CVSS 9.9 Critical EPSS 0.5% · p40
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
From the GitHub advisory
A Signature Wrapping attack has been found in samlify
Weakness type: CWE-347.
Product: samlify (npm) · Assigned by: GitHub_M · Published: 2025-05-19
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | samlify | < 2.10.0 | 2.10.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| tngan | samlify | < 2.10.0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 4.0 | 9.9 Critical | 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 | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-r683-v43c-6xqv published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-r683-v43c-6xqv github.com
- CVE.org record CVE-2025-47949 cve.org
- NVD entry CVE-2025-47949 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com