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Use Content Security Policy (CSP) headers to prevent XSS.

Audit or remove any old PHP guestbook scripts. Ensure that input data is thoroughly sanitized and parameterized to prevent cross-site scripting (XSS) and SQL injection vulnerabilities. Use Content Security Policy (CSP) headers to prevent XSS

By understanding these search queries, you're already one step ahead: you know what attackers are looking for, and you can take steps to ensure your own systems aren't on the list. Use Content Security Policy (CSP) headers to prevent XSS

Allowing attackers to upload web shells to execute commands on the host server. Use Content Security Policy (CSP) headers to prevent XSS

The Gwolle Guestbook WordPress plugin was affected by an Unauthenticated Stored Cross-Site Scripting (XSS) security vulnerability.

Prevent search engines from indexing sensitive administrative directories or third-party applet folders by configuring your robots.txt file properly: