Auth bypass in N8n-Io N8n
CVE-2026-118640
n8n before 1.123.85, 2.43.5, and 2.44.1 contains an authorization bypass vulnerability in Chat Hub that allows chat-only users to register restricted tool types. Users with the global:chatUser role can add and run tools through chat to execute sandboxed code, access permitted files, and use instance workflows, Data Tables, and agents.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-43v8-hjhm-chjp (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.85-2.43.5-and-2.44.1-chat-hub-aut… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118640?
- CVE-2026-118640 is a medium-severity vulnerability in N8n-Io N8n, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-28.
- How severe is CVE-2026-118640?
- Medium severity. CVSS v3 base score is 5.4 out of 10.