CVE-2026-34213 PUBLISHED

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

Assigner: GitHub_M
Reserved: 26.03.2026 Published: 14.04.2026 Updated: 15.04.2026

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.

Metrics

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

Product Status

Vendor docmost
Product docmost
Versions
  • Version >= 0.3.0, < 0.71.0 is affected

References

Problem Types

  • CWE-639: Authorization Bypass Through User-Controlled Key CWE