n8n — Vulnerability (CVE-2026-54306)
Date: 2026-06
Affected: n8n/n8n
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-54306
CWE: CWE-1321
CVSS: 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):