n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-42231. PoCs published by rudSarkar.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-42231, demonstrating XML prototype pollution in n8n leading to RCE via Git node manipulation. The PoC includes detailed technical analysis, Docker setup, and exploit scripts.
Description
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, a flaw in the xml2js library used to parse XML request bodies in n8n's webhook handler allowed prototype pollution via a crafted XML payload. An authenticated user with permission to create or modify workflows could exploit this to pollute the JavaScript object prototype and, by chaining the pollution with the Git node's SSH operations, achieve remote code execution on the n8n host. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Exploits (1)
This repository contains a functional exploit for CVE-2026-42231, demonstrating XML prototype pollution in n8n leading to RCE via Git node manipulation. The PoC includes detailed technical analysis, Docker setup, and exploit scripts.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H