lxml_html_clean is a project for HTML cleaning functionalities copied from "lxml.html.clean". Prior to version 0.4.0, the HTML Parser in lxml does not properly handle context-switching for special HTML tags such as "<svg>", "<math>" and "<noscript>". This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability. Via "remove_tags", one may specify tags to remove - their content is moved to their parents' tags. Via "kill_tags", one may specify tags to be removed completely. Via "allow_tags", one may restrict the set of permissible tags, excluding context-switching tags like "<svg>", "<math>" and "<noscript>".