Cross-Site Scripting in Docmost Comments Allows Code Execution

Publication date: 2026-04-21

Last updated on: 2026-04-23

Assigner: GitHub, Inc.

Description

Docmost 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 JavaScript URI as the link. When a user clicks on the link the JavaScript executes. This vulnerability is fixed in 0.80.0.

CVSS Scores

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Meta Information

Published

2026-04-21

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-40927

Affected Vendors & Products

Vendor	Product	Version / Range
docmost	docmost	to 0.80.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Docmost, an open-source collaborative wiki and documentation software. Prior to version 0.80.0, when a user leaves a comment on a page, it is possible to include a JavaScript URI as a link. If another user clicks on this link, the JavaScript code executes, which can lead to security issues.

Impact Analysis

The vulnerability allows execution of arbitrary JavaScript code when a user clicks on a malicious link in a comment. This can lead to cross-site scripting (XSS) attacks, potentially compromising user data, session tokens, or causing unauthorized actions within the application.

Mitigation Strategies

To mitigate this vulnerability, upgrade Docmost to version 0.80.0 or later, where the issue has been fixed.

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