Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The Dropdown Menu Widget WordPress plugin through 1.9.7 does not have authorisation and CSRF checks when saving its settings, allowing low privilege users such as subscriber to update them. Due to the lack of sanitisation and escaping, it could also lead to Stored Cross-Site Scripting issues
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.