Improper access control in n8n - #VU139103
Published: July 22, 2026
Vulnerability identifier: #VU139103
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive credentials.
The vulnerability exists due to improper access control in the Execute Sub-workflow node's inline workflow JSON handling when validating credential references in shared workflows. A remote user can reference a credential inside inline sub-workflow JSON to disclose sensitive credentials.
Exploitation requires workflow sharing to be enabled, editor access to a shared workflow, and knowledge of the target credential ID.
Remediation
Install security update from vendor's website.