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CVE-2026-54309— n8n: n8n MCP Browser HTTP Transport Exposes Unauthenticated Browser-Control Sessions

EPSS 0.40% · P32
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I. Basic Information for CVE-2026-54309

Vulnerability Information
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Vulnerability Title
n8n: n8n MCP Browser HTTP Transport Exposes Unauthenticated Browser-Control Sessions
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
n8n-ion8n >= 2.26.0, < 2.26.2 -

II. Public POCs for CVE-2026-54309

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III. Intelligence Information for CVE-2026-54309

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Other References for CVE-2026-54309 (1)

Same Patch Batch · n8n-io · 2026-06-23 · 21 CVEs total

CVE-2026-54314n8n: Denial of Service via ZIP decompression in webhook workflow
CVE-2026-44791n8n: XML Node Prototype Pollution Patch Bypass
CVE-2026-44789n8n: HTTP Request Node Pagination Prototype Pollution to RCE
CVE-2026-44792n8n: Source Control Pull SQL Injection
CVE-2026-44790n8n: Arbitrary File Read via Git Node
CVE-2026-49444n8n: Python sandbox escape
CVE-2026-49465n8n: Git Node Clone and Push Operations Bypass File Sandbox
CVE-2026-54304n8n: SecurityScorecard Node Leaks API Token to User-Controlled Host
CVE-2026-54301n8n: Same-Origin XSS in Respond to Webhook Node
CVE-2026-54310n8n: SQL Injection in Postgres v1/TimesclaeDB Nodes
CVE-2026-45732n8n: Cross-user Authorization Bypass in Dynamic Credential OAuth Endpoints
CVE-2026-54302n8n: Stored XSS in Chat Trigger Node
CVE-2026-54306n8n: Prototype Pollution enables confused-deputy execution via public webhooks
CVE-2026-54313n8n: NoSQL Injection in MongoDB Node Find And Replace Operation
CVE-2026-54303n8n: Reflected XSS via Facebook, WhatsApp, and Microsoft Teams Trigger Webhook Verificatio
CVE-2026-54305n8n: Cross-Tenant Credential Takeover via Dynamic Credentials EE Endpoints
CVE-2026-54307n8n: Credential Exfiltration via Permission Bypass
CVE-2026-54308n8n: Missing Token Validation on Microsoft Agent 365 Trigger Node
CVE-2026-54312n8n: Microsoft SQL Node Prototype Pollution
CVE-2026-54311n8n: Merge Node SQL Mode Prototype Pollution

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-306

V. Comments for CVE-2026-54309

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