| Component | n8n |
| Severity | critical (CVSS 10) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-25 |
| Affected versions | n8n < 2.25.7 n8n >= 2.26.0, < 2.26.2 |
| Fixed in | 2.25.7, 2.26.2 |
| Weakness | CWE-306 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
2.25.7or later (or the patched release of your branch: 2.26.2). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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