All in One SEO Plugin

If you use the All in One WordPress SEO Plugin

…you need to make sure it’s updated to at least version 4.1.5.3

As reported by many: The All in One SEO Plugin (for WordPress) has a bug or two — some claim they are Critical Vulnerabilities, it really depends on what webpage you read.

More details about this All on One SEO plugin issue:
https://threatpost.com/all-in-one-seo-plugin-bug-threatens-3m-wordpress-websites-takeovers/177240/
https://blog.sucuri.net/2021/12/critical-vulnerabilities-in-all-in-one-seo-plugin-affects-millions-of-wordpress-websites.html