What’s Vulnerable › Vulnerabilities

CVE-2026-103260: n8n before 2.39.6 and 2.40.x before 2.40.1 Approval Bypass via Send and Wait Node

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-01 · updated 2026-10-01
• Weakness: CWE-862

Description

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain an approval bypass vulnerability in the Send and Wait node's Approve Within Chat mode. Attackers can submit resume requests without verification of the requester's identity or approval permissions, allowing unauthenticated users to advance waiting executions and trigger guarded actions.

Affected products

• n8n-io n8n: before 2.39.6; from 2.40.0 before 2.40.1 — fixed in 2.39.6, 2.40.1

How to fix

Upgrade to a fixed version: n8n-io n8n 2.39.6, 2.40.1. Check the vendor advisory for mitigations.

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-342v-gmh6-738j
• https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-approval-bypass-via-send-and-wait-node

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