CVE-2026-54309
Description
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.
How to fix
- n8n n8n2.25.7, 2.26.2 or later
- n8n2.26.2, 2.25.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| n8n n8n | v < 2.25.7, 2.26.0 ≤ v < 2.26.2 | 2.25.7, 2.26.2 |
| n8nnpm | 2.26.0 ≤ v < 2.26.2, v < 2.25.7 | 2.26.2, 2.25.7 |
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Attack Surface Management
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