n8n-io n8n up to 2.25.6/2.26.1 Public prototype pollution

Summaryinfo

A vulnerability, which was classified as critical, has been found in n8n-io n8n up to 2.25.6/2.26.1. Affected by this vulnerability is an unknown functionality of the component Public Handler. This manipulation causes prototype pollution. This vulnerability is tracked as CVE-2026-54306. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in n8n-io n8n up to 2.25.6/2.26.1. Affected by this vulnerability is an unknown functionality of the component Public Handler. The manipulation with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields could be surfaced and consumed as normal values by downstream built-in nodes. Where a workflow combines a public webhook with action nodes that consume the resulting fields, an attacker could cause the workflow to act as a confused deputy — targeting unintended records or issuing outbound requests using the workflow owner's configured credentials. This vulnerability is fixed in 2.25.7 and 2.26.2.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-54306 since 06/12/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 2.25.7 or 2.26.2 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 2.25.0
• 2.25.1
• 2.25.2
• 2.25.3
• 2.25.4
• 2.25.5
• 2.25.6
• 2.26.0
• 2.26.1

Website

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

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