The Spider Calendar plugin for WordPress is a piece of software that is used on websites that run off the WordPress platform. Unfortunately, versions of this plugin, up to and including 1.1.2, have security flaws that can be exploited by attackers. These flaws include SQL Injection, Cross-Site Scripting, and Parameter Pollution. These are all forms of malicious code that can be used by attackers to steal sensitive information from the website’s database or inject malicious web scripts into pages. A malicious actor can exploit these flaws by appending additional SQL queries to existing queries or by sending a user a link which, if clicked, can inject the malicious code.