Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The TaxoPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Related Posts functionality in versions up to, and including, 3.6.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with Editor+ permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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.