CVE-2026-103255 n8n before 1.123.80, 2.39.6, and 2.40.1 Path Traversal and Query Injection via Supabase
Attackers can traverse paths in the Supabase node to bypass security controls and access or modify unauthorized data via unvalidated tableId parameters.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103255?
CVE-2026-103255 is a high-severity path traversal vulnerability in n8n-io n8n, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-73
Which versions are affected by CVE-2026-103255?
How do I fix CVE-2026-103255?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-103255 being exploited?
There is no known exploitation of CVE-2026-103255 in the wild and no public exploit code.
Sources
Also known as GHSA-34g6-xwv9-46f3, GHSA-rqch-9jrh-cr8w, MINI-wh46-c6hj-4gx2.