Vulnerability in N8n-Io N8n
CVE-2026-103255
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 path traversal vulnerability in the Supabase node where the tableId parameter is inserted into request paths without validation. Attackers can exploit workflows binding tableId to untrusted input to traverse to Auth and Storage APIs using the administrative serviceRole key, bypassing Row Level Security and enabling unauthorized data access and modification.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/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-rqch-9jrh-cr8w (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-path-travers… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103255?
- CVE-2026-103255 is a critical-severity vulnerability in N8n-Io N8n, classified under External Control of File Name or Path. CVSS score: 9.0/10. Published 2026-10-01.
- How severe is CVE-2026-103255?
- Critical severity. CVSS v3 base score is 9.0 out of 10.