CVE-2026-103246

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

State: Published
Severity: 8.3 High
Published: Oct 1, 2026
Updated: Oct 6, 2026
Reserved: Sep 30, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.3 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N	VulnCheck
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
n8nn8n-io	before 2.39.6Affected 2.40.0 to before 2.40.1Affected

References

GitHub Security Advisory (GHSA-9rhv-fhr8-7q5r)vendor-advisory
VulnCheck Advisory: n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspectionthird-party-advisory

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