passport-wsfed-saml2 vulnerable to Signature Bypass in SAML2 token

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.1 · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2017-16897: 1.38% estimated exploitation activity in the next 30 days; percentile 72.12 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Information Please note that this is not a new disclosure, and is previously reported in our SECURITY-NOTICE.md which we removed in favor of github advisory. Overview This vulnerability allows an attacker to impersonate another user and potentially elevate their privileges if the SAML identity provider: - signs SAML response and signs assertion - does not sign SAML response and signs assertion Am I affected? You may be affected if you use SAML2 protocol with passport-wsfed-saml2 versions below 3.0.5 and your SAML identity Provider: 1. signs SAML response and signs assertion; or 2. does not sign SAML response and signs assertion How do I fix it? You may fix this vulnerability by upgrading your library to version 3.0.5 or above. Will the fix impact my users? This fix patches the library that your application runs, but will not impact your users, their current state, or any existing sessions.

Published by the source

21 Jun 2023, 22:00 UTC

Last modified by the source

8 Nov 2023, 03:59 UTC

Source last checked

26 Oct 2026, 12:22 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-77fw-rf4v-vfp9

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-77fw-rf4v-vfp9

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# Patch Next advisory brief: CVE-2017-16897

Advisory: passport-wsfed-saml2 vulnerable to Signature Bypass in SAML2 token
IDs: CVE-2017-16897, GHSA-77fw-rf4v-vfp9
Record: https://patchnext.com/advisories/cve-2017-16897 (revision 2, source checked 26 Oct 2026, 12:22 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: passport-wsfed-saml2 3.0.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm passport-wsfed-saml2: affected < 3.0.5; fixed in 3.0.5

## Suggested inspection (read-only)
- `npm ls passport-wsfed-saml2 --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on passport-wsfed-saml2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-77fw-rf4v-vfp9 (OSV record GHSA-77fw-rf4v-vfp9 lists affected ranges: npm passport-wsfed-saml2 >=0 <3.0.5 (fixed))
- Verified: https://github.com/advisories/GHSA-77fw-rf4v-vfp9 (GitHub-reviewed advisory GHSA-77fw-rf4v-vfp9 lists affected ranges: npm passport-wsfed-saml2 >=0 <3.0.5)

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