Gruyere Learn Web Application Exploits Defenses Top

Gruyère is a classic, intentionally vulnerable web application created by Google. It is designed to teach beginners how hackers find flaws and how developers can stop them. It uses a "gray-box" approach, meaning you have access to the source code while you try to break the app.

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Gruyere uses cookies to remember who is logged in, but it doesn't protect them well. Crafting malicious inputs to trigger XSS: learners inject

• Crafting malicious inputs to trigger XSS: learners inject payloads into comment fields, profile pages, or search queries and observe execution contexts and DOM consequences.
• Forging state-changing requests for CSRF: by hosting a simple HTML page that issues POST requests, students see how authenticated sessions can be abused.
• Manipulating identifiers to bypass access controls: editing URL parameters or form fields to enumerate resources exposes authorization weaknesses.
• Triggering error-based information leaks: submitting unexpected inputs causes stack traces or debug output, revealing implementation details useful for follow-up attacks.
• Combining vulnerabilities: for example, using an XSS to steal CSRF tokens or session cookies, showing how chained vulnerabilities increase impact.