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Critical, CVSS 9.9amended

ApostropheCMS has Arbitrary File Write (Zip Slip / Path Traversal) in Import-Export Gzip Extraction

CVE-2026-32731GHSA-mwxc-m426-3f78

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@apostrophecms/import-export 3.5.3), 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
9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
  • CVE-2026-32731: 0.54% estimated exploitation activity in the next 30 days; percentile 45.39 (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.

Reported: 2026-03-08 Status: patched and released in version 3.5.3 of @apostrophecms/import-export --- Product | Field | Value | |---|---| | Repository | apostrophecms/apostrophe (monorepo) | | Affected Package | @apostrophecms/import-export | | Affected File | packages/import-export/lib/formats/gzip.js | | Affected Function | extract(filepath, exportPath) — lines ~132–157 | | Minimum Required Permission | Global Content Modify (any editor-level user with import access) | --- Vulnerability Summary The extract() function in gzip.js constructs file-write paths using: path.join() does not resolve or sanitise traversal segments such as ../. It concatenates them as-is, meaning a tar entry named ../../evil.js resolves to a path outside the intended extraction directory. No canonical-path check is performed before the write stream is opened. This is a textbook Zip Slip vulnerability. Any user who has been granted the Global Content Modify permission — a role routinely assigned to content…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-mwxc-m426-3f78

  2. Revision 2 · amended ·

    Amended from osv record GHSA-mwxc-m426-3f78

  3. Revision 1 · created ·

    Published from ghsa record GHSA-mwxc-m426-3f78

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-32731

Advisory: ApostropheCMS has Arbitrary File Write (Zip Slip / Path Traversal) in Import-Export Gzip Extraction
IDs: CVE-2026-32731, GHSA-mwxc-m426-3f78
Record: https://patchnext.com/advisories/cve-2026-32731 (revision 3, source checked 26 Oct 2026, 12:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @apostrophecms/import-export 3.5.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @apostrophecms/import-export: affected <= 3.5.2; fixed in 3.5.3

## Suggested inspection (read-only)
- `npm ls @apostrophecms/import-export --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 @apostrophecms/import-export.
- 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://github.com/advisories/GHSA-mwxc-m426-3f78 (GitHub-reviewed advisory GHSA-mwxc-m426-3f78 lists affected ranges: npm @apostrophecms/import-export >=0 <=3.5.2)
- Verified: https://osv.dev/vulnerability/GHSA-mwxc-m426-3f78 (OSV record GHSA-mwxc-m426-3f78 lists affected ranges: npm @apostrophecms/import-export >=0 <3.5.3 (fixed))

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