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Bitcoin payment processor BTCPay Server confirms critical vulnerability leading to fund theft, urges LND users to upgrade immediately.

2026.08.09 15:09:37

BTCPay Server has issued an emergency security advisory, stating that all versions prior to 2.4.2 (including the 2.4.2 release candidate) contain a critical vulnerability that has been actively exploited by attackers, resulting in user funds being stolen. The vulnerability allows unauthenticated remote attackers to obtain LND (Lightning Network implementation) .macaroon credential files, enabling them to take control of LND nodes and transfer funds. The official has confirmed the vulnerability was exploited to cause user fund losses, and urges all LND users to immediately upgrade to BTCPay Server 2.4.2 and LND 0.21.1. BTCPay Server’s on-chain wallets themselves are not affected. The official has not yet disclosed the exact amount of stolen funds. Public information shows that BTCPay Server is a free, open-source, self-hosted Bitcoin payment processor, focused on providing fee-free, non-custodial Bitcoin payment solutions for sovereign individuals and businesses. Core protocol contributors estimate there may be hundreds of thousands of BTCPay Server instances running globally, with over 1 million downloads from its main GitHub repository.

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