CVE-2026-103247 n8n - Broken Access Control

n8n < 1.123.80 contains a credential tampering vulnerability caused by duplicate node IDs bypassing workflow credential tamper guard, letting attackers with editor access retain victim credentials and redirect secrets.

CVSS base score 8.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-639

Vendor fix

Update to version 1.123.80 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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