n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE
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.
Problem Types
| Type | CWE ID | Description |
|---|
| CWE | CWE-1321 | CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') |
Type: CWE
Description: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 4.0 | 9.4 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
Version: 4.0
Base score: 9.4
Base severity: CRITICAL
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H