It is a server-side security issue affecting certain BTCPay Server setups using LND. TL;DRBTCPay Server v2.4.2 patches a critical LND credential exposure issue. When a merchant runs their own payment infrastructure, they are also responsible for keeping that infrastructure updated and properly configured. The issue involved BTCPay Server deployments using LND and the exposure of credential files. What Operators Should Take From ThisThe practical lesson is simple: update BTCPay Server and review LND exposure.