CVE-2011-1587: Mediawiki

Medium severity, CVSS 4.3. EPSS: 1.7% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in MediaWiki before 1.16.4, when Internet Explorer 6 or earlier is used, allows remote attackers to inject arbitrary web script or HTML via an uploaded file accessed with a dangerous extension such as .html located before a ? (question mark) in a query string, in conjunction with a modified URI path that has a %2E sequence in place of the . (dot) character. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1578.

Affected products

• Mediawiki Mediawiki: up to and including 1.16.3; version 1.1.0 only; version 1.2.0 only; version 1.2.1 only; version 1.2.2 only; version 1.2.3 only; …

Published 2011-04-27. Last modified 2026-06-16.