{"id":3570,"date":"2026-05-15T02:31:09","date_gmt":"2026-05-15T02:31:09","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/n8n-mcp-server-side-request-forgery-vulnerability-cve-2026-44694-critical-severity\/"},"modified":"2026-05-15T02:31:09","modified_gmt":"2026-05-15T02:31:09","slug":"n8n-mcp-server-side-request-forgery-vulnerability-cve-2026-44694-critical-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/n8n-mcp-server-side-request-forgery-vulnerability-cve-2026-44694-critical-severity\/","title":{"rendered":"n8n-MCP Server-Side Request Forgery Vulnerability (CVE-2026-44694) \u2014 CRITICAL Severity"},"content":{"rendered":"<p>In today&#8217;s digital landscape, keeping our systems secure is paramount. Even tools designed to streamline operations can, at times, harbor hidden dangers. This brings us to a significant security flaw recently identified in n8n-MCP, a valuable component for integrating AI assistants with n8n workflows.<\/p>\n<p>n8n-MCP serves as an MCP server, enabling AI assistants to access n8n node documentation, properties, and operations. However, a critical vulnerability has been discovered that could pose a serious risk to affected systems.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>CVE ID:<\/strong> CVE-2026-44694<\/li>\n<li><strong>Published Date:<\/strong> May 8, 2026<\/li>\n<li><strong>Severity:<\/strong> CRITICAL<\/li>\n<li><strong>Status:<\/strong> Analyzed<\/li>\n<\/ul>\n<h2>Affected Products<\/h2>\n<p>The authenticated Server-Side Request Forgery (SSRF) vulnerability impacts n8n-MCP versions from 2.18.7 up to, but not including, 2.50.2. Specifically, the issue affects the webhook trigger tools, the n8n API client (when configured via the <code>N8N_API_URL<\/code> environment variable), and per-request URLs supplied through the <code>x-n8n-url<\/code> header in multi-tenant HTTP mode.<\/p>\n<h2>Current Status<\/h2>\n<p>The good news is that this vulnerability has been thoroughly analyzed, and a patch is readily available. The issue has been officially addressed and fixed in n8n-MCP version 2.50.2.<\/p>\n<h2>Severity Level<\/h2>\n<p>Rated with a <strong>CRITICAL<\/strong> severity (CVSS Score 9.1), this authenticated Server-Side Request Forgery (SSRF) vulnerability should not be taken lightly. An SSRF flaw allows an attacker to compel the server-side application to make requests to an arbitrary domain of the attacker&#8217;s choosing, even if the target server is protected by a firewall. This means an attacker could potentially access internal resources, sensitive data, or interact with other systems within your network, bypassing existing security measures. The &#8220;authenticated&#8221; aspect means that an attacker would first need valid credentials to exploit this vulnerability, but once authenticated, the impact could be severe.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The most effective and strongly recommended solution is to <strong>immediately upgrade your n8n-MCP installation to version 2.50.2 or later<\/strong>. This version contains the necessary security fixes to prevent exploitation of CVE-2026-44694.<\/p>\n<p>It&#8217;s also important to note that the n8n API client now includes validation for the <code>N8N_API_URL<\/code> through the same SSRF protection mechanism used for user-supplied webhook URLs. If you are running n8n on the same host as n8n-MCP (e.g., using <code>N8N_API_URL=http:\/\/localhost:5678<\/code> or an RFC1918 address), you <strong>must<\/strong> configure <code>WEBHOOK_SECURITY_MODE=moderate<\/code> after upgrading. This setting allows localhost connections while still blocking access to sensitive cloud metadata. For production deployments with a publicly accessible n8n URL, the default <code>strict<\/code> mode remains unchanged and is recommended.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/commit\/bcaba839409d470abeb4a6ad9b361b553a1098eb<\/p>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/releases\/tag\/v2.50.2<\/p>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/security\/advisories\/GHSA-cmrh-wvq6-wm9r<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In today&#8217;s digital landscape, keeping our systems secure is paramount. Even tools designed to streamline operations can, at times, harbor hidden dangers. This brings us to a significant security flaw recently identified in n8n-MCP, a valuable component for integrating AI assistants with n8n workflows. n8n-MCP serves as an MCP server, enabling AI assistants to access [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1083,1092,868,696,1096],"class_list":["post-3570","post","type-post","status-publish","format-standard","hentry","category-security","tag-n8n-mcp","tag-security-patch","tag-ssrf","tag-vulnerability","tag-webhook"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>n8n-MCP Server-Side Request Forgery Vulnerability (CVE-2026-44694) \u2014 CRITICAL Severity - Web Hosting and IT Consultancy Services<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ucartz.com\/updates\/n8n-mcp-server-side-request-forgery-vulnerability-cve-2026-44694-critical-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"n8n-MCP Server-Side Request Forgery Vulnerability (CVE-2026-44694) \u2014 CRITICAL Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"In today&#8217;s digital landscape, keeping our systems secure is paramount. 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