Description
In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).
Remediation
References
Related Vulnerabilities
XWiki URL Redirection to Untrusted Site ('Open Redirect') Vulnerability (CVE-2023-29204)
WordPress Plugin cloudsafe365_for_WP 'file' Parameter Remote File Disclosure (1.46)
WordPress Plugin iThemes Security (formerly Better WP Security) Information Disclosure (5.1.1)
WordPress Plugin Custom Search by BestWebSoft Unspecified Vulnerability (1.21)
WordPress Plugin Simple File List Cross-Site Scripting (4.4.11)