In a web application vulnerability investigation, which type of vulnerability should NOT be expected?

In the context of investigating vulnerabilities within web applications, virtual machine (VM) escape vulnerabilities are not typically expected. VM escape pertains to a situation where a malicious entity can break out of a virtualized environment, gaining access to the host operating system and potentially impacting other virtual machines. This type of vulnerability is more relevant in environments using virtualization technologies rather than web applications directly.

On the other hand, SQL injection, cross-site scripting (XSS), and file inclusion are all common types of vulnerabilities associated with web applications. SQL injection involves manipulating backend SQL queries through a web interface, allowing attackers to interfere with database operations. Cross-site scripting allows attackers to inject malicious scripts into web pages viewed by other users, posing security threats such as data theft or session hijacking. File inclusion vulnerabilities enable attackers to include and execute files on the web server, leading to potential breaches of sensitive data.

Given this context, the correct conclusion is that VM escape is not a vulnerability one would typically associate with a direct web application investigation.