{"id":10957,"date":"2026-02-26T10:03:50","date_gmt":"2026-02-26T10:03:50","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/02\/26\/firefox-148-released-with-sanitizer-api-to-disable-xss-attack\/"},"modified":"2026-02-26T10:03:50","modified_gmt":"2026-02-26T10:03:50","slug":"firefox-148-released-with-sanitizer-api-to-disable-xss-attack","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/02\/26\/firefox-148-released-with-sanitizer-api-to-disable-xss-attack\/","title":{"rendered":"Firefox 148 Released With Sanitizer API to Disable XSS Attack"},"content":{"rendered":"

Firefox 148 Released With Sanitizer API to Disable XSS Attack
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Firefox 148 introduces the new standardized Sanitizer API, becoming the first browser to implement it. The update marks a major step forward for web security, giving developers a straightforward and effective way to prevent Cross-Site Scripting (XSS) attacks.<\/a><\/p>\n

XSS is one of the most common and persistent vulnerabilities on the internet. It has ranked among the top three web vulnerabilities for nearly ten years.<\/p>\n

These attacks happen when a website accidentally allows bad actors to inject malicious HTML or JavaScript<\/a> through user-generated content.<\/p>\n

Once injected, attackers can monitor users\u2019 activities, manipulate their interactions, and steal sensitive data.<\/p>\n

For years, preventing XSS has been difficult. Mozilla previously led efforts with the Content-Security-Policy (CSP)<\/a> standard in 2009.<\/p>\n

While CSP is a strong defense that restricts what resources a browser can load, it requires major changes to a website\u2019s architecture and continuous review by security experts. Because of this, CSP has not been widely adopted by all websites.<\/p>\n

The new Sanitizer API fills this security gap. It provides a standardized way to convert harmful HTML into safe, harmless HTML before it is inserted into a webpage.<\/p>\n

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XSS Attack (Source: Mozilla) <\/figcaption><\/figure>\n

How the Sanitizer API Works<\/strong><\/h2>\n

The core of this new protection is the\u00a0setHTML()\u00a0method. It integrates sanitization directly into the HTML insertion process, ensuring websites are safe by default.<\/p>\n

For example, if an attacker tries to inject this harmful code:<\/p>\n

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XSS Attack Script (Source: Mozilla) <\/figcaption><\/figure>\n

The Sanitizer API will automatically clean it up. It keeps the safe\u00a0<h1>\u00a0text but removes the dangerous\u00a0<img>\u00a0element and its harmful\u00a0onclick\u00a0action.<\/p>\n

The resulting safe code looks like this:<\/p>\n

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XSS Attack Script sanitized (Source: Mozilla) <\/figcaption><\/figure>\n

Developers can easily improve their website\u2019s security with minimal effort. By simply replacing the older, risky\u00a0innerHTML\u00a0method with the new\u00a0setHTML()\u00a0method, they can activate stronger XSS protections.<\/p>\n

If the default settings are too strict or not strict enough, developers can create a custom configuration to choose exactly which HTML elements to allow.<\/p>\n

Mozilla also offers a Sanitizer API playground where developers can test the tool before using it on a live site.<\/p>\n

For maximum protection, the Sanitizer API works perfectly with Trusted Types, another security feature supported in Firefox 148<\/a>.<\/p>\n

Together, they control how HTML is parsed and injected, blocking unsafe methods and preventing future XSS flaws.<\/p>\n

According to Mozilla Hacks,<\/a> Firefox 148 makes XSS prevention easier with the new Sanitizer API, with other browsers expected to adopt it soon.<\/p>\n

Follow us on Google News<\/a>, LinkedIn<\/a>, and X<\/a> for daily cybersecurity updates. Contact us<\/a> to feature your stories.<\/strong><\/p>\n

The post Firefox 148 Released With Sanitizer API to Disable XSS Attack<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\n

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Firefox 148 Released With Sanitizer API to Disable XSS Attack Firefox 148 introduces the new standardized Sanitizer API, becoming the first browser to implement it. The update marks a major step forward for web security, giving developers a straightforward and effective way to prevent Cross-Site Scripting (XSS) attacks. XSS is one of the most common […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129,63,568,783],"tags":[130],"class_list":["post-10957","post","type-post","status-publish","format-standard","hentry","category-cyber-security","category-cyber-security-news","category-firefox","category-mozilla","tag-cyber-security-news"],"_links":{"self":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/10957"}],"collection":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/comments?post=10957"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/10957\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=10957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=10957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=10957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}