Multiple Plugins - Cross-Site Scripting From Third-party Library

Proof of Concept

WP-Optimize - Reflected Cross-Site Scripting

1. Go to the plugin settings and in the "Images" section check the box "Create WebP version of image".
2. Visit the page: /?s=<script>alert(/XSS/)</script>

SrbTransLatin - Contributor+ Stored Cross-Site Scripting

1. Create a post and add the following content: <script>alert(/XSS/)</script>
2. Load the post on the frontend, and see the XSS alert.