There are many common vulnerabilities that can affect web applications, including the following:
- SQL injection: This type of attack allows an attacker to execute malicious SQL code in a database, potentially allowing them to access sensitive data or take control of the database.
- Cross-site scripting (XSS): This vulnerability allows an attacker to inject malicious code into a website, which is then executed by other users who visit the site. This can allow the attacker to steal sensitive information, such as login credentials, or to perform other malicious actions.
- Cross-site request forgery (CSRF): This vulnerability allows an attacker to trick a user into making unintended actions on a website, such as changing their password or transferring money.
- Broken authentication and session management: This vulnerability occurs when a website fails to properly authenticate and manage user sessions, potentially allowing an attacker to gain unauthorized access to a user’s account.
- Insecure direct object references: This vulnerability occurs when a web application exposes direct object references, such as file paths or database keys, in its URLs or forms. This can allow an attacker to access sensitive information or manipulate data.
Overall, the most common vulnerabilities in web applications are those related to security and access control, such as the ones I just mentioned. It is important for web developers to be aware of these vulnerabilities and take steps to prevent them.