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.
Severity (CVSS)
| Base score | 8.8 |
|---|---|
| Severity | High |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-306 — CWE-306: Missing Authentication for Critical Function
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n8n-io | n8n | >= 2.26.0, < 2.26.2; < 2.25.7 |
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-qrx8-25qr-5r7v (x_refsource_CONFIRM)
Generated from the official CVE List on 24 Jun 2026 09:35 UTC.