CVE-2022-21710: Mediawiki Shortdescription

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

ShortDescription is a MediaWiki extension that provides local short description support. A cross-site scripting (XSS) vulnerability exists in versions prior to 2.3.4. On a wiki that has the ShortDescription enabled, XSS can be triggered on any page or the page with the action=info parameter, which displays the shortdesc property. This is achieved using the wikitext `{{SHORTDESC:<img src=x onerror=alert()>}}`. This issue has a patch in version 2.3.4.

Affected products

• Mediawiki Shortdescription: before 2.3.4 (fixed in 2.3.4)

Published 2022-01-24. Last modified 2026-06-17.