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.
cxsecurity.com/issue/WLB-2019120110
cxsecurity.com/issue/WLB-2019120111
cxsecurity.com/issue/WLB-2019120112
themeforest.net/item/citybook-directory-listing-wordpress-theme/21694727
themeforest.net/item/easybook-directory-listing-wordpress-theme/23206622
themeforest.net/item/townhub-directory-listing-wordpress-theme/25019571
wpvulndb.com/vulnerabilities/10013
wpvulndb.com/vulnerabilities/10014
wpvulndb.com/vulnerabilities/10018