Google Gruyere is available for immediate use at https://google-gruyere.appspot.com/ . Visiting the site and clicking "Start hacking" creates a unique instance for your training session. The codelab works through a series of exercises covering vulnerabilities including XSS, CSRF, path traversal, information disclosure, denial-of-service, and remote code execution.
Vulnerabilities illustrated in Gruyere Gruyere bundles many canonical web vulnerabilities; the most important include: gruyere learn web application exploits defenses top
File upload functionality that doesn't properly restrict file types or location, allowing an attacker to upload a Python script and execute it. Google Gruyere is available for immediate use at
Modifying the admin status of a user account or accessing functionality intended only for administrators. Effective XSS prevention requires a multi-layered approach
Protect session cookies by applying the Secure , HttpOnly , and SameSite=Strict attributes to prevent unauthorized script access and cross-domain leakage.
Effective XSS prevention requires a multi-layered approach. First, is essential. Different contexts (HTML body, attributes, JavaScript strings, URLs) require different encoding strategies. Simply stripping angle brackets is insufficient—attackers have numerous ways to bypass such filters.