Description
In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, 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 <a> 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.
Remediation
References
Related Vulnerabilities
Joomla Other Vulnerability (CVE-2006-0303)
WordPress Plugin WordPress Users 'uid' Parameter SQL Injection (1.3)
MySQL CVE-2018-3182 Vulnerability (CVE-2018-3182)
e107 Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2018-15901)
ownCloud Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2016-1500)