Improper Neutralization of Equivalent Special Elements in GitHub repository btcpayserver/btcpayserver prior to 1.7.5.
https://huntr.dev/bounties/3a73b45c-6f3e-4536-a327-cdfdbc59896f
http://packetstormsecurity.com/files/171732/BTCPay-Server-1.7.4-HTML-Injection.html