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TI-2026-39205 Aliases CVE-2026-54309GHSA-qrx8-25qr-5r7v

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

Priority MEDIUM 45CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00546 45th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 2.26.2, 2.25.7n8n (npm): 2.26.2, 2.25.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8n2.26.0 to before 2.26.2; before 2.25.72.26.2, 2.25.7Patch availableCNA
—n8n (npm)2.26.0 to before 2.26.22.26.2Patch availableGHSA-qrx8-25qr-5r7v
—n8n (npm)before 2.25.72.25.7Patch availableGHSA-qrx8-25qr-5r7v
  • n8n Vendorn8n Affected 2.26.0 to before 2.26.2; before 2.25.7 Fixed in 2.26.2, 2.25.7 Patch available CNA
  • n8n (npm) Vendor— Affected 2.26.0 to before 2.26.2 Fixed in 2.26.2 Patch available GHSA-qrx8-25qr-5r7v
  • n8n (npm) Vendor— Affected before 2.25.7 Fixed in 2.25.7 Patch available GHSA-qrx8-25qr-5r7v

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 2.25.7; 2.26.0 to before 2.26.2Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 2.25.7; 2.26.0 to before 2.26.2 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 2.26.2, 2.25.7
  • Fix · GHSA-qrx8-25qr-5r7v n8n (npm) Fixed in 2.26.2 Advisory →
  • Fix · GHSA-qrx8-25qr-5r7v n8n (npm) Fixed in 2.25.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54309
  2. 2026-10-03 Alias added: GHSA-qrx8-25qr-5r7v

References

Advisory 2

Other 1

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
  • TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences