CVE-2026-34213
Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
10th
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.
| CWE | CWE-639 |
| Vendor | docmost |
| Product | docmost |
| Published | Apr 14, 2026 |
| Last Updated | Apr 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
docmost / docmost
>= 0.3.0, < 0.71.0