CVE-2026-42236

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the MCP OAuth client registration endpoint accepted unauthenticated requests and stored client data without adequate resource controls. An unauthenticated remote attacker could exhaust server memor...

Cross-site Scripting (XSS)

Overview n8n-editor-ui is a Workflow Editor UI for n8n Affected versions of this package are vulnerable to Cross-site Scripting XSS via the clientname parameter in the MCP OAuth client registration process. An attacker can execute arbitrary JavaScript in a victim's authenticated browser session b...

Allocation of Resources Without Limits or Throttling

Overview n8n is a n8n Workflow Automation Tool Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the MCP OAuth client registration process. An attacker can exhaust server memory resources and render the instance unavailable by sending lar...