CVE-2026-103246

n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspection

8.3 High

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.26%Unchanged since Oct 2, 2026

What each source reports

CVE List Score used 8.3

n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspection

Record: CVE-2026-103246
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-639
Updated: 2026-11-02

EUVDEUVD-2026-90750 8.3

Record: EUVD-2026-90750
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-6w8v-v5w3-7x56 8.3

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during...

Record: GHSA-6w8v-v5w3-7x56
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-639
Updated: 2026-11-02

NVD 8.3

Record: CVE-2026-103246
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-639
Updated: 2026-11-02

OSV 8.3

n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspection

Record: CVE-2026-103246
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Weakness: CWE-639
Updated: 2026-11-02

Affected products

n8n-io n8n

History

History
Recorded	Changed	Sources
Nov 2, 2026	affected, aliases, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-103246 is a high vulnerability (CVSS 8.3) in N8n-io N8n, published October 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. No source names a fixed version.