# BTCPay Server Vulnerability Leads to Bitcoin and Litecoin Theft

Critical security flaws in outdated software versions allow attackers to drain hot wallets.

- **Source:** [The Hacker News](https://brifing.si/source/f944ec2b-8180-47bc-94de-57085b5a6563)
- **Published:** 2026-11-03
- **Topic:** [Software & Engineering](https://brifing.si/c/engineering)
- **Original article:** <https://thehackernews.com/2026/11/hackers-exploit-btcpay-server-flaw-to.html>
- **On Brifing:** https://brifing.si/s/1ea60ef5-cbc1-471c-81f6-cf1910244777

## Critical Vulnerability Disclosure

BTCPay Server has issued an urgent advisory regarding the theft of Bitcoin and Litecoin from hot wallets. The attacks specifically target instances running software version 2.4.1 or earlier. Users are strongly encouraged to upgrade to version 2.4.7 immediately to mitigate risks associated with these critical and medium-severity security vulnerabilities.

## Attack Mechanism and Scope

Investigations indicate that attackers exploited vulnerabilities in older versions, specifically those predating the 2.4.2 patch released on August 7, 2026. While the exact start date of the campaign remains unknown, reports of unauthorized fund drains began surfacing around November 1, 2026. The platform has identified specific wallet addresses linked to these incidents.

## Recovery and Remediation Steps

For users running vulnerable versions, the platform advises migrating to a fresh server with a new wallet, regardless of whether theft has been detected. The entire machine and all stored secrets must be treated as compromised. If using a hosting provider, instances may have been automatically shut down to prevent further exploitation.

## Operational Security Best Practices

To minimize future risk, the team emphasizes keeping only minimal funds required for daily operations on the server. All other assets should be moved to wallets where spending keys are held off-server. This compartmentalization strategy limits the potential impact if a specific server instance is breached by remote attackers or unauthorized entities.

## Historical Context of Exploits

In August 2026, BTCPay Server disclosed a critical vulnerability that allowed unauthenticated remote attackers to obtain .macaroon credential files for LND. These credentials enabled attackers to take control of Lightning Network nodes and move funds. It remains unclear if the current wave of attacks is directly related to this previous security flaw.

## Broader Cryptocurrency Security Climate

This incident occurs amidst a series of high-profile security breaches across the crypto ecosystem. Recent events include a $6.43 billion theft from Binance and a $2.65 million exploit at Polymarket. Additionally, Trezor reported a supply chain attack involving physically tampered hardware wallets, highlighting the diverse threat landscape currently facing digital asset holders.

## Mercado Bitcoin Exchange Breach

Brazil's Mercado Bitcoin recently paused services following a security breach resulting in $49 million in stolen funds. Through collaboration with partners like Tether and Chainalysis, the exchange successfully blocked $11 million. Tether CEO Paolo Ardoino confirmed the freezing of 4.5 million USDT to assist in the containment efforts during this ongoing investigation.

## Systemic Risk and Vigilance

The recurring nature of these exploits underscores the necessity for rigorous patch management and identity visibility in security operations. Whether dealing with self-hosted payment processors or centralized exchanges, the rapid identification of threats is essential. Organizations must prioritize attack surface visibility to protect against both software vulnerabilities and sophisticated supply chain attacks.

## Sources covering this story

- https://thehackernews.com/2026/11/hackers-exploit-btcpay-server-flaw-to.html — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._