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Medium, CVSS 6.5amended

CSRF token fixation in fastify-passport

CVE-2023-29020GHSA-2ccf-ffrj-m4qw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@fastify/passport 2.3.0, 1.1.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS
  • CVE-2023-29020: 0.38% estimated exploitation activity in the next 30 days; percentile 32.51 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The CSRF protection enforced by the @fastify/csrf-protection library, when combined with @fastify/passport, can be bypassed by network and same-site attackers. Details fastify/csrf-protection implements the synchronizer token pattern (using plugins @fastify/session and @fastify/secure-session) by storing a random value used for CSRF token generation in the csrf attribute of a user's session. The @fastify/passport library does not clear the session object upon authentication, preserving the csrf attribute between pre-login and authenticated sessions. Consequently, CSRF tokens generated before authentication are still valid. Network and same-site attackers can thus obtain a CSRF token for their pre-session, fixate that pre-session in the victim's browser via cookie tossing, and then perform a CSRF attack after the victim authenticates. Fix As a solution, newer versions of @fastify/passport include the configuration options clearSessionOnLogin (default: true) and…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-2ccf-ffrj-m4qw

  2. Revision 1 · created ·

    Published from osv record GHSA-2ccf-ffrj-m4qw

Agent brief

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# Patch Next advisory brief: CVE-2023-29020

Advisory: CSRF token fixation in fastify-passport
IDs: CVE-2023-29020, GHSA-2ccf-ffrj-m4qw
Record: https://patchnext.com/advisories/cve-2023-29020 (revision 2, source checked 26 Oct 2026, 12:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @fastify/passport 2.3.0, 1.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @fastify/passport: affected < 1.1.0; >= 2.0.0, < 2.3.0; fixed in 1.1.0, 2.3.0

## Suggested inspection (read-only)
- `npm ls @fastify/passport --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 @fastify/passport.
- 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-2ccf-ffrj-m4qw (OSV record GHSA-2ccf-ffrj-m4qw lists affected ranges: npm @fastify/passport >=0 =2.0.0 <2.3.0 (fixed))
- Verified: https://github.com/advisories/GHSA-2ccf-ffrj-m4qw (GitHub-reviewed advisory GHSA-2ccf-ffrj-m4qw lists affected ranges: npm @fastify/passport >=0 =2.0.0 <2.3.0)

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