CVE-2026-34213 MEDIUM

CVE-2026-34213: Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation

Vendor Docmost
Product docmost
Weakness CWE-639 · IDOR
Published April 14, 2026
Last update April 15, 2026
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 14, 2026 CVE published
April 15, 2026 Record updated