MediaWiki Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2015-2938
Cross-site scripting (XSS) vulnerability in MediaWiki before 1.19.24 1.2x before 1.23.9 and 1.24.x before 1.24.2 allows remote attackers to inject arbitrary web script or HTML via a custom JavaScript file which is not properly handled when previewing the file.