CVE-2021-3830: Btcpayserver Btcpay Server

Medium severity, CVSS 5.4. EPSS: 0.6% 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: up to and including 1.2.3

Published 2021-09-26. Last modified 2026-06-17.