Input validation vulnerability in Email Artillery (MASS EMAIL) 4.1

The Email Artillery (MASS EMAIL) plugin for WordPress is vulnerable to a security issue called Stored Cross-Site Scripting. This means that anyone using versions up to and including 4.1 of the plugin may be at risk of having malicious code injected into the pages of their website. If this happens, the code will run whenever a user visits the affected page, potentially allowing the attacker to gain unauthorized access to the website. To protect against this, users of this plugin should make sure that their version is up to date and that input is sanitized and output is escaped.