CVE-2026-54309
CriticalCVSS 10.0Exploitation Probability (EPSS)
Low risk32th percentile — higher than 32% of all known CVEs
Summary
n8n is an open source workflow automation platform. Prior to versions 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP transport mode, the MCP endpoint accepts session initialization and tool invocation requests without any authentication.
Risk Assessment
Any network-reachable client or any website visited by the user can establish an MCP session and invoke browser-control tools, posing a serious risk to the user's data security.
Recommendation
It is recommended to upgrade to versions 2.25.7 or 2.26.2 to mitigate this vulnerability and to avoid running @n8n/mcp-browser in HTTP transport mode.
Original NVD description (English source)
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, when @n8n/mcp-browser is run in HTTP transport mode, the MCP endpoint accepts session initialization and tool invocation requests without any authentication. Any network-reachable client, or any website visited by the user, can establish an MCP session and invoke browser-control tools. Where the n8n AI Browser Bridge extension is installed and a browser connection is active, an unauthenticated caller can access browser-control capabilities including navigation, JavaScript evaluation, and cookie and storage access against the user's real browser profile. This issue only affects instances where @n8n/mcp-browser is run with the HTTP transport (--transport http). This vulnerability is fixed in 2.25.7 and 2.26.2.