Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The package serve-lite in versions prior to 1.1.2 are vulnerable to Cross-site Scripting (XSS) because when it detects a request to a directory, it renders a file listing of all of its contents with links that include the actual file names without any sanitization or output encoding.
CWE-79 - Cross Site Scripting
Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.