CVE-2026-34213

Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation

State: Published
Severity: 5.4 Medium
Published: Apr 14, 2026
Updated: Apr 15, 2026
Reserved: Mar 26, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
docmostdocmost	>= 0.3.0, < 0.71.0Affected

References

https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp

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