Input validation vulnerability in Postie 1.9.70

The Postie plugin for WordPress has a security issue that can be exploited by hackers. This can happen through the admin settings and can affect all versions up to 1.9.70. The problem is that the plugin does not properly clean up user input and output, which allows attackers with high levels of access to insert harmful code into pages that will run when the page is viewed. This only affects websites with multiple installations and websites where a certain security feature has been turned off.