CVE-2026-103247: n8n before 1.123.80 Credential Tampering via Duplicate Node IDs

Severity: high (CVSS 8.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-639

Description

n8n versions before 1.123.80 contain a credential tampering vulnerability where duplicate node IDs bypass the workflow credential tamper guard. Attackers with editor access to shared workflows can exploit mismatched node ID and name matching to retain victim credentials and redirect secrets to attacker-controlled hosts.

Affected products

n8n-io n8n: before 1.123.80 — fixed in 1.123.80

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.80. Check the vendor advisory for mitigations.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-7gjv-rcf8-x5qc
https://www.vulncheck.com/advisories/n8n-before-1.123.80-credential-tampering-via-duplicate-node-ids

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