Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The Wordfence Security – Firewall & Malware Scan plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 7.6.0 via a setting on the options page due to insufficient escaping on the stored value. This makes it possible for authenticated users, with administrative privileges, to inject malicious web scripts into the setting that executes whenever a user accesses a page displaying the affected setting on sites running a vulnerable version.
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.