CVE-2026-113658

ApostropheCMS: Unauthenticated CSV import requests leave rejected uploads in the system temporary directory

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

apostrophecms · apostrophe

CVSS v3.1 GITHUB

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

EPSS

0.61% chance of exploitation in the next 30 days, 49th percentile

Published

2026-10-20

Updated

2026-10-23

Proof-of-concept exploits (1)

• advisories/GHSA-qhcq-9pm2-c9w9find archive

CVE references

• apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ceREFERENCE
• apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350REFERENCE
• apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0REFERENCE
• apostrophecms/apostrophe/security/advisories/GHSA-qhcq-9pm2-c9w9REFERENCE

References

• CVE Record
• NVD entry