A PHP library that sanitizes user input to prevent Cross-Site Scripting (XSS) attacks.
AntiXSS is a PHP security library that sanitizes user input to protect web applications from Cross-Site Scripting (XSS) attacks. It cleans strings and arrays by removing or encoding malicious scripts, event handlers, and dangerous attributes, helping secure forms, URLs, and other user-supplied data. The library emphasizes proactive sanitization during data submission rather than runtime processing for robust security.
PHP developers building web applications that handle user-generated content, such as form submissions, comments, or dynamic HTML output, and need a dedicated tool to prevent XSS vulnerabilities. It is also suited for security-conscious teams integrating input sanitization into their data processing pipelines.
Developers choose AntiXSS for its thorough, configurable approach to XSS protection that goes beyond basic regex parsing, handling various encoding attempts like hexadecimal, Unicode, and inline CSS-based attacks. Its structured API allows fine-tuning of security rules, such as customizing evil HTML tags and attributes, and it includes detection features like isXssFound() to identify attacks.
㊙️ AntiXSS | Protection against Cross-site scripting (XSS) via PHP
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Methods like addEvilHtmlTags() and removeEvilAttributes() allow customization of malicious elements, demonstrated in Example 7 where iframes are allowed after removal from the evil list.
Handles advanced XSS vectors including hexadecimal, Unicode, and inline CSS attacks, as shown in Examples 2-5 where encoded scripts are neutralized.
The isXssFound() method identifies if an XSS attempt was made in the last sanitization run, useful for logging and security monitoring (Example 6).
Can sanitize both strings and arrays via xss_clean(), making it versatile for batch processing of user data, as noted in the method signature.
The README explicitly warns it 'should only be used to deal with data upon submission,' limiting its application in dynamic content processing scenarios.
It admits html-sanitizer or HTML Purifier are better for more configurable solutions, indicating it may lack advanced HTML sanitization features.
Setting up custom rules requires multiple method calls (e.g., addEvilHtmlTags, removeEvilAttributes), which can be error-prone and time-consuming for specific use cases.