HTML Injection Testing

HTML injection exploits unsanitized web application input to alter page content for phishing or defacement. It differs from cross-site scripting by injecting raw HTML tags to modify the DOM structure rather than executing JavaScript payloads.

Test for HTML injection by identifying input reflection points and submitting crafted HTML payloads via GET, POST, or URL parameters. Check if the application sanitizes the input or renders the injected tags directly within the page structure.

HTML injection testing requires a solid understanding of HTML, HTTP protocols, and web application input handling. You need knowledge of how unsanitized user input is reflected on web pages to successfully identify and exploit content injection flaws.

Yes, HTML injection testing involves crafting specific payloads to demonstrate website defacement by altering visible content and creating phishing attacks by injecting malicious forms to trick users into submitting credentials.

HTML injection testing is limited to vulnerabilities where user input is reflected without proper sanitization. Modern web applications with robust input validation, output encoding, or Content Security Policy headers will effectively prevent content injection attacks.