Description
The MsUpload extension for MediaWiki is vulnerable to stored XSS via the msu-continue system message, which is inserted into the DOM without proper sanitization. The vulnerability occurs in the file upload UI when the same filename is uploaded twice.
This issue affects Mediawiki - MsUpload extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Wikimedia Foundation | Mediawiki - MsUpload extension | 1.39.x – < 1.39.13, 1.42.x – < 1.42.7, 1.43.x – < 1.43.2 | 1.39.13 |
Advisories 1
- WID-SEC-2025-1525 MediaWiki Extensions und Skins: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 23, 2025