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Advisories

n8n - Permission Bypass via Expression Parser Mismatch in External Secrets

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severity
medium
date
Affecting

  • n8n >= 0, < 1.123.61

  • n8n >= 0, < 2.28.1

  • n8n >= 0, < 2.27.4

CWE
  • CWE-639 Authorization Bypass Through User-Controlled Key
CVSS
6.0
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
YLChen-007
Description
n8n before versions 1.123.61, 2.27.4, and 2.28.1 contains a permission bypass vulnerability in external secrets handling caused by a mismatch between the static validation check and the runtime expression engine. An authenticated user with credential create or update permissions but without the externalSecret:list scope can embed external secret references into credentials in forms the static validation does not detect; these references resolve at workflow execution time, exposing secret values the user is not authorized to access. This issue only affects instances where an external secrets provider is configured and Advanced Permissions are in use.

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