User Impersonation Affecting n8n-nodes-base package, versions <1.121.9>=2.0.0 <2.5.0
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.
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Test your applications- Snyk IDSNYK-JS-N8NNODESBASE-15360948
- published27 Feb 2026
- disclosed26 Feb 2026
- creditSimon Köck
Introduced: 26 Feb 2026
CVE-2026-56357 (opens in a new tab)How to fix?
Upgrade n8n-nodes-base to version 1.121.9, 2.5.0 or higher.
Overview
n8n-nodes-base is a Base nodes of n8n
Affected versions of this package are vulnerable to User Impersonation via the GitHub Webhook Trigger component. An attacker can trigger unauthorized workflow executions by sending unsigned POST requests to the webhook endpoint, thereby injecting arbitrary data into the workflow.
Workaround
This vulnerability can be mitigated by limiting workflow creation and editing permissions to fully trusted users only, and restricting network access to the webhook endpoint to known GitHub webhook IP ranges.