CVE-2026-103260
Deferred Deferred - Pending Action

Approval Bypass in n8n Send and Wait Node

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: VulnCheck

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.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103260
EUVD
EUVD-2026-90654

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
n8n n8n to 2.39.6 (exc)
n8n n8n From 2.40.0 (inc) to 2.40.1 (exc)
n8n n8n to 2.40.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

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

Detection Guidance

Check n8n version with: n8n --version. If running versions before 2.39.6 or 2.40.1, the system is vulnerable. Inspect Send and Wait node configurations for 'Approve Within Chat' mode enabled on publicly accessible instances. Monitor logs for unexpected resume requests or execution advances without proper approval.

Impact Analysis

Unauthenticated attackers could bypass approval gates and trigger actions on your n8n instance if it uses the vulnerable Send and Wait node with Approve Within Chat mode enabled. This could lead to unauthorized workflow executions or data processing without proper oversight.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized access to guarded actions through an approval bypass. If exploited, it may lead to unauthorized data processing or disclosure, violating confidentiality and integrity requirements under these regulations.

Mitigation Strategies

Upgrade n8n to versions 2.39.6, 2.40.1, or later immediately. Disable 'Approve Within Chat' mode until patched. Restrict instance access to trusted users only. Remove public exposure of approval channels. Temporarily avoid using the feature for critical actions until resolved.

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