CVE-2013-4303: Mediawiki

Medium severity, CVSS 6.1. EPSS: 1.5% chance of exploitation in the next 30 days.

includes/libs/IEUrlExtension.php in the MediaWiki API in MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 does not properly detect extensions when there are an even number of "." (period) characters in a string, which allows remote attackers to conduct cross-site scripting (XSS) attacks via the siprop parameter in a query action to wiki/api.php.

Affected products

• Mediawiki Mediawiki: from 1.19.0, before 1.19.8 (fixed in 1.19.8); from 1.20.0, before 1.20.7 (fixed in 1.20.7); from 1.21.0, before 1.21.2 (fixed in 1.21.2)

Published 2019-12-11. Last modified 2026-06-16.