CVE-2021-3646: Btcpayserver Btcpay Server

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

btcpayserver is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

• Btcpayserver Btcpay Server: before 1.2.3 (fixed in 1.2.3)

Published 2021-09-10. Last modified 2026-06-17.