Missing Authentication for Critical Function Affecting @n8n/n8n-nodes-langchain package, versions <1.122.16>=2.0.0 <2.9.1>=2.10.0 <2.10.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Missing Authentication for Critical Function vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-N8NN8NNODESLANGCHAIN-15361254
- published27 Feb 2026
- disclosed26 Feb 2026
- creditsm1ee
Introduced: 26 Feb 2026
CVE-2026-56353 (opens in a new tab)How to fix?
Upgrade @n8n/n8n-nodes-langchain to version 1.122.16, 2.9.1, 2.10.1 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authentication for Critical Function in the Chat Trigger node when configured with n8n User Auth authentication. An attacker can gain unauthorized access by circumventing the authentication check.
Note:
This is only exploitable if the Chat Trigger node is configured with n8n User Auth authentication (non-default).
Workaround
This vulnerability can be mitigated by limiting workflow creation and editing permissions to fully trusted users only, using a different authentication method for the Chat Trigger node, or restricting network access to the webhook endpoint to trusted origins.