Stored XSS in Docmost Wiki via MIME Type Spoofing

Publication date: 2026-04-14

Last updated on: 2026-04-23

Assigner: GitHub, Inc.

Description

Docmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) attack due to improper handling of MIME type spoofing (GHSL-2026-052). An attacker could exploit this flaw to inject malicious scripts, potentially compromising the security of users and data. Version 0.70.0 contains a patch.

CVSS Scores

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Meta Information

Published

2026-04-14

Last Modified

2026-04-23

Generated

2026-07-06

AI Q&A

2026-04-15

EPSS Evaluated

2026-07-05

NVD

CVE-2026-33193

Affected Vendors & Products

Vendor	Product	Version / Range
docmost	docmost	to 0.70.0 (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 affects Docmost, an open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) attack caused by improper handling of MIME type spoofing. This flaw allows an attacker to inject malicious scripts into the application.

Impact Analysis

Exploitation of this vulnerability could lead to malicious scripts being executed in the context of users interacting with the Docmost software. This can compromise the security of users and data by potentially allowing attackers to steal information, hijack user sessions, or perform unauthorized actions.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Docmost to version 0.70.0 or later, as this version contains the patch that fixes the stored cross-site scripting (XSS) issue caused by improper handling of MIME type spoofing.

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