CVE-2026-34213: Docmost

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.

Affected products

• Docmost Docmost: from 0.3.0, before 0.71.0 (fixed in 0.71.0)

Published 2026-04-14. Last modified 2026-07-24.