CVE-2026-34213

Medium

Description

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.

SeverityMedium

CVSS5.4

Exploit probability—

ProductDocmost

PublishedApr 14, 2026

First seenApr 14, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

docmost docmost0.71.0 or later

Affected products

Product	Affected versions	Fixed in
docmost docmost	0.3.0 ≤ v < 0.71.0	0.71.0

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