CVE-2026-54309

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 v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/security/advisories/GHSA-qrx8-25qr-5r7v	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n::::::node.js::*
	cpe:2.3:a:n8n:n8n::::::node.js::*

History

25 Jun 2026, 18:40

Type	Values Removed	Values Added
CPE		cpe:2.3:a:n8n:n8n::::::node.js::*
First Time		N8n N8n n8n
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 10.0
References	~~() https://github.com/n8n-io/n8n/security/advisories/GHSA-qrx8-25qr-5r7v -~~	() https://github.com/n8n-io/n8n/security/advisories/GHSA-qrx8-25qr-5r7v - Mitigation, Vendor Advisory

23 Jun 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-23 16:17

Updated : 2026-06-25 18:40

NVD link : CVE-2026-54309

Mitre link : CVE-2026-54309

CVE.ORG link : CVE-2026-54309

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-306

Missing Authentication for Critical Function

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