CVE-2026-113658 ApostropheCMS: Unauthenticated CSV import requests leave rejected uploads in the system temporary directory
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113658?
CVE-2026-113658 is a high-severity vulnerability in apostrophecms apostrophe, published on 20 Oct 2026.
Official description
ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0, the unauthenticated Rich Text CSV conversion route writes a multipart upload to the system temporary directory before checking its extension and does not remove the staged file when that validation rejects it. Repeated large rejected uploads, using the normal public CSRF cookie, can persistently consume temporary-disk capacity and may disrupt ApostropheCMS and other services that depend on the same partition. This issue is fixed in version 4.33.0.
Which versions are affected by CVE-2026-113658?
2 open source packages ship an affected version, including apostrophe.
| Package | Affected | Fixed in |
|---|---|---|
apostrophe npm | All versions | 4.33.0 |
apostrophe npm | All versions | 4.33.0 |
How do I fix CVE-2026-113658?
Upgrade apostrophe to 4.33.0 or later.
Is CVE-2026-113658 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-113658 exists.
Sources
Also known as GHSA-qhcq-9pm2-c9w9.