GHSA-qrx8-25qr-5r7v

Source

https://github.com/advisories/GHSA-qrx8-25qr-5r7v

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qrx8-25qr-5r7v/GHSA-qrx8-25qr-5r7v.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qrx8-25qr-5r7v

Aliases

CVE-2026-54309

Downstream

MINI-cgqc-j2v7-46qf

Published

2026-06-16T23:32:31Z

Modified

2026-07-20T13:45:32Z

Severity

10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L CVSS Calculator
8.8 (High) CVSS_V4 - 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 CVSS Calculator

Summary

n8n: MCP Browser HTTP Transport Exposes Unauthenticated Browser-Control Sessions

Details

Impact

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). The default transport is stdio, which is not affected.

Patches

The issue has been fixed in n8n versions 2.25.7, and 2.26.2. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Avoid running @n8n/mcp-browser with the HTTP transport; use the default stdio transport instead.
If HTTP transport is required, restrict network access to the listening port to trusted clients only using host-based firewall rules.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Database specific

{
    "cwe_ids":  [
        "CWE-306"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-16T23:32:31Z",
    "nvd_published_at":  "2026-06-23T16:17:01Z",
    "severity":  "HIGH"
}

References

Affected packages

npm / n8n

Package

Name: n8n; View open source insights on deps.dev
Purl: pkg:npm/n8n

Affected ranges

Type: SEMVER
Events: Introduced

2.26.0

Fixed

2.26.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qrx8-25qr-5r7v/GHSA-qrx8-25qr-5r7v.json"

npm / n8n

Package

Name: n8n; View open source insights on deps.dev
Purl: pkg:npm/n8n

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.25.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-qrx8-25qr-5r7v/GHSA-qrx8-25qr-5r7v.json"