GHSA-4vr7-m8p8-434h MediaWiki Cross-site Scripting (XSS) vulnerability

• Packagist mediawiki/core: >= 1.31.0, < 1.31.9 → fixed in 1.31.9 • Packagist mediawiki/core: >= 1.32.0, < 1.34.3 → fixed in 1.34.3 • Packagist mediawiki/core: >= 1.35.0-rc.0, < 1.35.0 → fixed in 1.35.0

In MediaWiki before 1.31.9 and 1.32.x through 1.34.x before 1.34.3, XSS related to jQuery can occur. The attacker creates a message with [javascript:payload xss] and turns it into a jQuery object with mw.message().parse(). The expected result is that the jQuery object does not contain an tag (or it does not have a href attribute, or it's empty, etc.). The actual result is that the object contains an <a href ="javascript... that executes when clicked.