CVE-2026-103255

Critical

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.

SeverityCritical

CVSS9.0

Exploit probability—

ProductN8n

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-73CWE-73

How to fix

Update

n8n-io n8n1.123.80, 2.39.6, 2.40.1 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-rqch-9jrh-cr8w

Affected products

Product	Affected versions	Fixed in
n8n-io n8n	v < 1.123.80, 2.0.0 ≤ v < 2.39.6, 2.40.0 ≤ v < 2.40.1	1.123.80, 2.39.6, 2.40.1

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