Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M
CVE-2026-113658ApostropheCMS: Unauthenticated CSV import requests leave rejected uploads in the system temporary directory
High 7.5
In plain English
A high-severity uncontrolled resource consumption in apostrophe from apostrophecms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | apostrophe | 4.33.0 | GHSA-qhcq-9pm2-c9w9 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| apostrophecms | apostrophe | < 4.33.0 |
Weakness: CWE-400, CWE-459, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-qhcq-9pm2-c9w9 x_refsource_CONFIRM
- https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce x_refsource_MISC
- https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350 x_refsource_MISC
- https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0 x_refsource_MISC