Input validation vulnerability in Hotlink2Watermark 0.3.2

A plugin called Hotlink2Watermark for WordPress has a security issue that affects all versions up to 0.3.2. The problem is with a function that doesn’t properly check for a security code, making it possible for hackers to do something without having to log in. This could happen if they trick the person in charge of the website into clicking on a link. It’s not clear what the consequences of this vulnerability could be.