ApostropheCMS: Archive duplicate continuation lets contributors overwrite published content

Exploitation

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

CVSS

6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS

• CVE-2026-112956: 0.34% estimated exploitation activity in the next 30 days; percentile 27.39 (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.

Review scope and evidence limits Package: @apostrophecms/import-export, version 3.7.0. Release tag reviewed: @apostrophecms/import-export@3.7.0, commit 9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce (September 30, 2026). Current main reviewed: 5ce3732be0ebdebb4db0f8ef160c81e8671157e6. The importer, gzip extractor, import permission gate, and core permission implementation have no differences between that release tag and the reviewed main. This follow-up is a static remediation review. We have not repeated the original end-to-end reproductions against the latest release or tested a deployed site. Current exploitability and impact therefore still require maintainer validation; the observations below establish that the reported security checks remain absent in public source. The original emailed PDF contains the original reproduction material. Please refer to that existing private attachment. Archive duplicate continuation permits unauthorized published-content replacement The…

Published by the source

21 Oct 2026, 16:59 UTC

Last modified by the source

21 Oct 2026, 17:15 UTC

Source last checked

26 Oct 2026, 13:07 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-jf5h-36mg-rp6x

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-jf5h-36mg-rp6x

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-jf5h-36mg-rp6x

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# Patch Next advisory brief: CVE-2026-112956

Advisory: ApostropheCMS: Archive duplicate continuation lets contributors overwrite published content
IDs: CVE-2026-112956, GHSA-jf5h-36mg-rp6x
Record: https://patchnext.com/advisories/cve-2026-112956 (revision 3, source checked 26 Oct 2026, 13:07 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: @apostrophecms/import-export 3.7.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @apostrophecms/import-export: affected < 3.7.1; fixed in 3.7.1

## 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-jf5h-36mg-rp6x (GitHub-reviewed advisory GHSA-jf5h-36mg-rp6x lists affected ranges: npm @apostrophecms/import-export >=0 <3.7.1)
- Verified: https://osv.dev/vulnerability/GHSA-jf5h-36mg-rp6x (OSV record GHSA-jf5h-36mg-rp6x lists affected ranges: npm @apostrophecms/import-export >=0 <3.7.1 (fixed))

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