CVE-2026-27578: n8n Vulnerable to Stored XSS via Various Nodes
Impact An authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different techniques on various nodes (Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node). Scripts injected by a malicious workflow execute in the browser of any user who visits the affected page, enabling session hijacking and account takeover.
Patches The issues have been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. - Disable the Webhook node by adding n8n-nodes-base.webhook to the NODESEXCLUDE environment variable.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Credit Reporters: - @ori-ron - @Aikido-Security - @nil340 - Pawel Bednarz from the NATO Cyber Security Centre (NCSC)
Other sources
n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different techniques on various nodes (Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node). Scripts injected by a malicious workflow execute in the browser of any user who visits the affected page, enabling session hijacking and account takeover. The issues have been fixed in n8n versions 2.10.1 and 1.123.21. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or disable the Webhook node by adding n8n-nodes-base.webhook to the NODESEXCLUDE environment variable. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
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Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-27578?
CVE-2026-27578 is categorized as a high severity vulnerability due to the potential for arbitrary script injection in the n8n application.
How do I fix CVE-2026-27578?
To fix CVE-2026-27578, update n8n to version 2.10.1, 2.9.3, or 1.123.22 depending on your current version.
What areas of n8n are affected by CVE-2026-27578?
CVE-2026-27578 affects several nodes in n8n, including the Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node.
Can an unauthenticated user exploit CVE-2026-27578?
No, CVE-2026-27578 requires authentication and specific permissions to create or modify workflows in n8n.
What potential impact does CVE-2026-27578 have on n8n users?
CVE-2026-27578 allows authenticated users to inject arbitrary scripts into pages, which could lead to data leakage or unauthorized actions within the application.