The CTHthemes CityBook before 2.3.4, TownHub before 1.0.6, and EasyBook before 1.2.2 themes for WordPress allow Persistent XSS via the chat widget/page message form.
https://wpvulndb.com/vulnerabilities/10018
https://wpvulndb.com/vulnerabilities/10014
https://wpvulndb.com/vulnerabilities/10013
https://themeforest.net/item/townhub-directory-listing-wordpress-theme/25019571
https://themeforest.net/item/easybook-directory-listing-wordpress-theme/23206622
https://themeforest.net/item/citybook-directory-listing-wordpress-theme/21694727