The All in One SEO went through two security vulnerabilities in recent history. One occurred in July of 2020. Wordfence, a WordPress security plugin, discovered that contributor-level access or above website users could create malicious scripts on WordPress websites using the All in One SEO plugin. The second security breach occurred in December of 2021. The All in One SEO immediately released a patch to solve the issue. Make sure you're running the most recent version of All in One SEO to avoid this issue. You might want to consider using a WordPress security plugin like Wordfence for additional website security.