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Vulnerability record · CVE-2026-34213 · published 14 April 2026

CVE-2026-34213: Docmost insecure direct object reference vulnerability

Docmost · Docmost

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.

5.4 CVSS 3.1 Medium EPSS 0.29% · top 80.9% CWE-639 · Insecure direct object reference
5.4CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
24 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-22249Docmost path traversal vulnerabilityDocmost is an open-source collaborative wiki and documentation software. From 0.21.0 to before 0.24.0, Docmost is vulnerable to Arbitrary File Write …EPSS 0.57%6.3CVE-2026-23630Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. In versions 0.3.0 through 0.23.2, Mermaid code block rendering is vulnerable to…EPSS 0.28%6.1CVE-2025-55574Docmost cross-site scripting vulnerabilityCross Site Scripting vulnerability in docmost v.0.21.0 and before allows an attacker to execute arbitrary codeEPSS 0.28%5.4CVE-2026-40927Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. Prior to 0.80.0, when leaving a comment on a page, it is possible to include a …EPSS 0.23%5.4CVE-2026-34212Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. In versions prior to 0.71.0, improper neutralization of attachment URLs in Docm…EPSS 0.24%5.4CVE-2026-24045Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. From 0.20.0 and before 0.25.0, the public share page functionality in Docmost d…EPSS 0.23%4.6CVE-2026-33193Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) …EPSS 0.23%4.3CVE-2026-33146Docmost improper authorization vulnerabilityDocmost is open-source collaborative wiki and documentation software. An authorization bypass vulnerability in versions 0.70.0 through 0.70.2 exposes…EPSS 0.31%

Source: NIST National Vulnerability Database (record CVE-2026-34213), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.