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CVE-2026-54309

CVE-2026-54309 · n8n: n8n MCP Browser HTTP Transport Exposes Unauthenticated Browser-Control Sessions

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.8 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • n8n

    Versions
    • >= 2.26.0, < 2.26.2: Affected
    • < 2.25.7: Affected

    No fix published

  • n8n npm

    Affected ranges
    • SEMVER: ≥ 2.26.0, < 2.26.2

    Update to 2.26.2

  • n8n npm

    Affected ranges
    • SEMVER: < 2.25.7

    Update to 2.25.7

Original sources

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