n8n-io n8n up to 2.39.5/2.40.0 Send/Wait node permission

Summaryinfo

A vulnerability was found in n8n-io n8n up to 2.39.5/2.40.0. It has been classified as problematic. This affects an unknown function of the component Send/Wait node. This manipulation causes permission. This vulnerability is registered as CVE-2026-103260. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 2.39.5/2.40.0. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Send/Wait node. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-103260 since 09/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1222 for this issue.

Upgrading to version 2.39.6 or 2.40.1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30
• 2.31
• 2.32
• 2.33
• 2.34
• 2.35
• 2.36
• 2.37
• 2.38
• 2.39
• 2.39.0
• 2.39.1
• 2.39.2
• 2.39.3
• 2.39.4
• 2.39.5
• 2.40.0

Website

• Product: https://github.com/n8n-io/n8n/

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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