CVE-2026-34213

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 5.4
EPSS 0.0004
EPSS Percentile 12.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (2)
docmost/docmost 0.3.0 - 0.71.0
docmost/docmost >= 0.3.0, < 0.71.0
Published Apr 14, 2026
Tracked Since Apr 15, 2026