Auth bypass in N8n-Io N8n
CVE-2026-103260
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain an approval bypass vulnerability in the Send and Wait node's Approve Within Chat mode. Attackers can submit resume requests without verification of the requester's identity or approval permissions, allowing unauthenticated users to advance waiting executions and trigger guarded actions.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/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-342v-gmh6-738j (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-approva… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103260?
- CVE-2026-103260 is a medium-severity vulnerability in N8n-Io N8n, classified under Missing Authorization. CVSS score: 4.0/10. Published 2026-10-01.
- How severe is CVE-2026-103260?
- Medium severity. CVSS v3 base score is 4.0 out of 10.