A web vulnerability is a specific type of programming or configuration error. Vulnerabilities make it possible for malicious hackers to access resources that should be inaccessible, including sensitive data, application code, or the web server’s operating system. Such security defects may also allow attackers to use your vulnerable website or web application as a tool for other malicious activities, like phishing attacks.

Here are the most common and dangerous web vulnerabilities at a glance – see the full index for more: