---
title: "CVE-2026-113711: ApostropheCMS - Authentication Bypass"
description: "ApostropheCMS prior to 4.33.0 and import-export module prior to 3.7.0 contain an authorization bypass caused by missing early authorize callback in bigUploadMiddleware, letting unauthenticated attackers perform upload initialization and cleanup, exploit requires unauthenticated access."
url: https://panop.io/threat-heartbeat/CVE-2026-113711/
---

# CVE-2026-113711 ApostropheCMS - Authentication Bypass

ApostropheCMS prior to 4.33.0 and import-export module prior to 3.7.0 contain an authorization bypass caused by missing early authorize callback in bigUploadMiddleware, letting unauthenticated attackers perform upload initialization and cleanup, exploit requires unauthenticated access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-113711)

## Details

Type

Authentication Bypass

Impact

Denial Of Service

CVSS vector

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

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-400](https://cwe.mitre.org/data/definitions/400.html)

## Vendor fix

Upgrade ApostropheCMS to 4.33.0 and import-export module to 3.7.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-113711](https://nvd.nist.gov/vuln/detail/CVE-2026-113711)
- [https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce](https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce)
- [https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350](https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350)
- [https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0](https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0)
- [https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq](https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-86wm-68pq-5jwq)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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