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

CVE-2026-34213

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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
docmost / docmost	affected >= 0.3.0, < 0.71.0

CWE

CWE-639

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.