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Advisories

n8n before 1.123.73 Remote Code Execution via $fromAI Prototype Leak

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severity
high
date
Affecting

  • n8n >= 0, < 1.123.73

  • n8n >= 0, < 2.36.2

  • n8n >= 0, < 2.35.4

CWE
  • CWE-94 Improper Control of Generation of Code ('Code Injection')
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Haruna38
Description
n8n versions before 1.123.73, 2.35.4, and 2.36.2 contain an expression sandbox escape in the $fromAI handler. $fromAI resolved a caller-supplied placeholder name without requiring it to be an own property and admitted reserved keys; against a primitive input value it returned a live host-prototype reference. An attacker with workflow-build privilege can walk the prototype chain to the Function constructor and compile/execute arbitrary code in the main n8n process, leading to remote code execution.

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