ApostropheCMS: Authenticated Object-Level Authorization Bypass in exist-in-locale Reveals Restricted Localized Draft Identifiers

Exploitation

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

CVSS

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

EPSS

• CVE-2026-113660: 0.36% estimated exploitation activity in the next 30 days; percentile 30.18 (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.

Summary ApostropheCMS’s exist-in-locale API allows an authenticated low-privilege user to determine whether restricted documents exist in a specified locale and mode, including draft mode. The endpoint returns localized document identifiers without applying document-level view or edit authorization criteria. The issue was reproduced against a real local ApostropheCMS application running the reviewed source code. The test used a synthetic guest account and synthetic restricted draft records. Details Exact vulnerable source path: packages/apostrophe/modules/@apostrophecms/i18n/index.js:503-529 Exact API route: POST /api/v1/@apostrophecms/i18n/exist-in-locale The handler verifies only that the requester is authenticated: It then performs a direct database lookup using attacker-controlled document IDs, locale, and mode: This query does not apply: .permission('view') .permission('edit') apos.permission.criteria(req, 'view') object-level document authorization locale-specific authorization…

Published by the source

20 Oct 2026, 18:19 UTC

Last modified by the source

20 Oct 2026, 18:30 UTC

Source last checked

26 Oct 2026, 13:07 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vmxh-77cw-65j7

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-vmxh-77cw-65j7

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-vmxh-77cw-65j7

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# Patch Next advisory brief: CVE-2026-113660

Advisory: ApostropheCMS: Authenticated Object-Level Authorization Bypass in exist-in-locale Reveals Restricted Localized Draft Identifiers
IDs: CVE-2026-113660, GHSA-vmxh-77cw-65j7
Record: https://patchnext.com/advisories/cve-2026-113660 (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 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: apostrophe 4.33.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm apostrophe: affected < 4.33.0; fixed in 4.33.0

## Suggested inspection (read-only)
- `npm ls apostrophe --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 apostrophe.
- 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-vmxh-77cw-65j7 (GitHub-reviewed advisory GHSA-vmxh-77cw-65j7 lists affected ranges: npm apostrophe >=0 <4.33.0)
- Verified: https://osv.dev/vulnerability/GHSA-vmxh-77cw-65j7 (OSV record GHSA-vmxh-77cw-65j7 lists affected ranges: npm apostrophe >=0 <4.33.0 (fixed))

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