Auth bypass in N8n-Io N8n
CVE-2026-103251
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/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-fmmv-p585-7c8x (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-package-inst… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103251?
- CVE-2026-103251 is a high-severity vulnerability in N8n-Io N8n, classified under Missing Authorization. CVSS score: 7.1/10. Published 2026-10-01.
- How severe is CVE-2026-103251?
- High severity. CVSS v3 base score is 7.1 out of 10.