CVE-2026-103246

High

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.

SeverityHigh

CVSS7.7

Exploit probability—

ProductN8n

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

n8n-io n8n2.39.6, 2.40.1 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-9rhv-fhr8-7q5r

Affected products

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

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