"XSS has a long history of being notoriously difficult to prevent and has ranked among the top three web vulnerabilities (CWE-79) for nearly a decade. An XSS vulnerability arises when a website inadvertently lets attackers inject arbitrary HTML or JavaScript through user-generated content. With this attack, an attacker could monitor and manipulate user interactions and continually steal user data for as long as the vulnerability remains exploitable."
"Firefox has been deeply involved in solutions for XSS from the beginning, starting with spearheading the Content-Security-Policy (CSP) standard in 2009. CSP allows websites to restrict which resources (scripts, styles, images, etc.) the browser can load and execute, providing a strong line of defense against XSS. Despite a steady stream of improvements and ongoing maintenance, CSP did not gain sufficient adoption to protect the long tail of the web."
"The Sanitizer API is designed to help fill that gap by providing a standardized way to turn malicious HTML into harmless HTML - in other words, to sanitize it. The setHTML() method integrates sanitization directly into HTML insertion, providing safety by default. This sanitization will allow safe HTML elements while removing embedded dangerous elements and their malicious attributes."
Cross-site scripting (XSS) remains a critical web vulnerability, ranking among the top three security threats for nearly a decade. XSS occurs when websites allow attackers to inject arbitrary HTML or JavaScript through user-generated content, enabling data theft and user manipulation. Firefox previously championed Content-Security-Policy (CSP) in 2009 to restrict resource loading, but CSP failed to achieve widespread adoption due to architectural complexity. The new Sanitizer API addresses this gap by providing a standardized, developer-friendly method to sanitize untrusted HTML. The setHTML() method integrates sanitization directly into DOM insertion, offering security by default and removing dangerous elements and attributes while preserving safe HTML structure.
Read at Mozilla Hacks - the Web developer blog
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