Auth bypass in N8n-Io N8n
CVE-2026-103247
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-7gjv-rcf8-x5qc (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.80-credential-tampering-via-dupli… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103247?
- CVE-2026-103247 is a high-severity vulnerability in N8n-Io N8n, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.5/10. Published 2026-10-01.
- How severe is CVE-2026-103247?
- High severity. CVSS v3 base score is 8.5 out of 10.