WordPress Postie plugin <= 1.9.40 - Stored Cross-Site Scripting (XSS) and post submission spoofing vulnerabilities

Stored Cross-Site Scripting XSS and post submission spoofing vulnerabilities found by V1n1v131r4 in WordPress Postie plugin versions = 1.9.40. Solution 06.01.2020 - we were unable to find a patched version of this plugin...