The WP Go Maps (formerly WP Google Maps) WordPress plugin before 9.0.28 does not properly protect most of its REST API routes, which attackers can abuse to store malicious HTML/Javascript on the site.
https://wpscan.com/vulnerability/f5687d0e-98ca-4449-98d6-7170c97c8f54
https://wpscan.com/blog/stored-xss-fixed-in-wp-go-maps-9-0-28/