Popup Maker <= 1.16.10 is vulnerable to Auth. Stored Cross-Site Scripting (XSS) vulnerability

The Popup Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 1.16.10 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.