The Ninja Forms Contact Form plugin used for WordPress has a security issue that allows hackers to insert harmful scripts into web pages. This can happen if they are able to trick a user into clicking a link. The plugin’s lack of proper protection makes it vulnerable to this type of attack, known as Reflected Self-Based Cross-Site Scripting. To fully exploit this vulnerability, the attacker would also need to take advantage of a specific setting called “maintenance mode”, which is only activated during updates. However, this mode is only active for a short period of time, making it difficult for hackers to use. Even if they were able to activate maintenance mode, they would still need to use other techniques to execute their harmful code on the targeted user’s device.