CVE-2025-32013: LNbits Lightning Network Payment System Vulnerable to Server-Side Request Forgery via LNURL Authentication Callback

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
• EPSS 0.6%, percentile 50: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 50% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes lnbits (PyPI) <= 0.12.12, no fixed version listed. Check your lockfile, including transitive dependencies.

What it is

LNbits is a Lightning wallet and accounts system. A Server-Side Request Forgery (SSRF) vulnerability has been discovered in LNbits' LNURL authentication handling functionality. When processing LNURL authentication requests, the application accepts a callback URL parameter and makes an HTTP request to that URL using the httpx library with redirect following enabled. The application doesn't properly validate the callback URL, allowing attackers to specify internal network addresses and access internal resources.

From the GitHub advisory

Server-Side Request Forgery via LNURL Authentication Callback in LNbits Lightning Network Payment System

Disclaimer

This vulnerability was detected using XBOW, a system that autonomously finds and exploits potential security vulnerabilities. The finding has been thoroughly reviewed and validated by a security researcher before submission. While XBOW is intended to work autonomously, during its development human experts ensure the accuracy and relevance of its reports.

Description

A Server-Side Request Forgery (SSRF) vulnerability has been discovered in LNbits' LNURL authentication handling functionality. The vulnerability exists in the LNURL authentication callback process where the application makes HTTP requests to user-provided callback URLs and follows redirects without proper validation.

Weakness type: CWE-918.

Product: lnbits (PyPI) · Assigned by: GitHub_M · Published: 2025-04-06

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation poc, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 50.

Timeline

• 2025-04-06 — CVE record published by GitHub_M
• 2025-04-07 — CVE record last updated
• 2025-04-07 — GitHub-reviewed advisory GHSA-qp8j-p87f-c8cc published (critical)

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-qp8j-p87f-c8cc github.com
2. CVE.org record CVE-2025-32013 cve.org
3. NVD entry CVE-2025-32013 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com

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