Auth bypass in N8n-Io N8n
CVE-2026-103246
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
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-9rhv-fhr8-7q5r (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-credent… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103246?
- CVE-2026-103246 is a high-severity vulnerability in N8n-Io N8n, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-10-01.
- How severe is CVE-2026-103246?
- High severity. CVSS v3 base score is 7.7 out of 10.