CVE-2026-34213

MEDIUM5.4

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

Published Apr 14, 2026

Modified 3 days ago

Details

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

WEB

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

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-34213

CVSS Analysis

CVSS v3.1

5.4

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

LowI:L

Availability

LowA:L

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

Weakness Type (CWE)

Other

CWE-639

Ecosystems

Timeline

PublishedApr 14, 2026

ModifiedApr 15, 2026