CVE-2026-103255: External Control of File Name or Path in n8n-io n8n
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.
AI Analysis
Technical Summary
CVE-2026-103255 describes a path traversal vulnerability in the n8n workflow automation tool's Supabase node. The issue occurs because the tableId parameter is inserted into request paths without proper validation. Attackers who can bind the tableId parameter to untrusted input in workflows may traverse to Auth and Storage APIs using the administrative serviceRole key. This bypasses Row Level Security controls and allows unauthorized access and modification of data. The vulnerability affects n8n versions >=0 <1.123.80, >=2.0.0 <2.39.6, and >=2.40.0 <2.40.1.
Potential Impact
Exploitation of this vulnerability allows attackers to bypass Row Level Security and gain unauthorized access to sensitive data and modify it by leveraging the administrative serviceRole key in Supabase APIs. This could lead to data breaches and unauthorized data manipulation within affected n8n deployments.
Mitigation Recommendations
A fix is available in n8n versions 1.123.80, 2.39.6, and 2.40.1 and later. Users should upgrade to these versions or later to remediate this vulnerability. No vendor advisory content was provided, but the affected versions and fixed versions are clearly stated, indicating official fixes exist.
CVE-2026-103255: External Control of File Name or Path in n8n-io n8n
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.
CVSS v4.0
Score 7.1high
Affected software
n8n-io
n8n
pkg:github/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103255 describes a path traversal vulnerability in the n8n workflow automation tool's Supabase node. The issue occurs because the tableId parameter is inserted into request paths without proper validation. Attackers who can bind the tableId parameter to untrusted input in workflows may traverse to Auth and Storage APIs using the administrative serviceRole key. This bypasses Row Level Security controls and allows unauthorized access and modification of data. The vulnerability affects n8n versions >=0 <1.123.80, >=2.0.0 <2.39.6, and >=2.40.0 <2.40.1.
Potential Impact
Exploitation of this vulnerability allows attackers to bypass Row Level Security and gain unauthorized access to sensitive data and modify it by leveraging the administrative serviceRole key in Supabase APIs. This could lead to data breaches and unauthorized data manipulation within affected n8n deployments.
Mitigation Recommendations
A fix is available in n8n versions 1.123.80, 2.39.6, and 2.40.1 and later. Users should upgrade to these versions or later to remediate this vulnerability. No vendor advisory content was provided, but the affected versions and fixed versions are clearly stated, indicating official fixes exist.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:55:39.869Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7492a43b0b3b89bd1ce4
Added to database: 10/01/2026, 14:56:18 UTC
Last enriched: 10/01/2026, 15:22:29 UTC
Last updated: 10/01/2026, 19:41:31 UTC
Views: 6
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