AI agent vulnerability · n8n

CVE-2026-54302: n8n: Stored XSS in Chat Trigger Node

highCVSS 4.0 7.0 · 3.1 7.6GHSA-42h7-m79w-wvg5

Impact An authenticated user with workflow edit access could inject arbitrary JavaScript into the Chat Trigger's generated page by setting a malicious webhookId. When a logged-in user visited the chat URL, the injected code executed in the n8n origin with that user's session privileges. Patches The issue has been fixed in n8n versions 1.123.55, 2.25.7, and 2.26.2.

Published Jun 16, 2026 · Updated Jul 20, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 1.123.55
Fixed in: 1.123.55
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.26.0, < 2.26.2
Fixed in: 2.26.2
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.0.0-rc.0, < 2.25.7
Fixed in: 2.25.7
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

An authenticated user with workflow edit access could inject arbitrary JavaScript into the Chat Trigger's generated page by setting a malicious webhookId. When a logged-in user visited the chat URL, the injected code executed in the n8n origin with that user's session privileges.

Patches

The issue has been fixed in n8n versions 1.123.55, 2.25.7, and 2.26.2. 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 Chat Trigger node by adding @n8n/n8n-nodes-langchain.chatTrigger to the NODES_EXCLUDE environment variable.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to sm1ee.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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