CVE-2026-103255 n8n - Path Traversal

n8n < 1.123.80, 2.0.0 < 2.39.6, and 2.40.0 < 2.40.1 contain a path traversal caused by unvalidated insertion of tableId parameter in Supabase node request paths, letting attackers bypass Row Level Security to access and modify data, exploit requires workflows binding tableId to untrusted input.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-73

Vendor fix

Update to version 1.123.80, 2.39.6, 2.40.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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