{"id":3937,"date":"2026-07-17T18:01:38","date_gmt":"2026-07-17T18:01:38","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/n8n-mcp-data-exposure-vulnerability-cve-2026-55608-medium-severity\/"},"modified":"2026-07-17T18:01:38","modified_gmt":"2026-07-17T18:01:38","slug":"n8n-mcp-data-exposure-vulnerability-cve-2026-55608-medium-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/n8n-mcp-data-exposure-vulnerability-cve-2026-55608-medium-severity\/","title":{"rendered":"n8n-MCP Data Exposure Vulnerability (CVE-2026-55608) \u2014 Medium Severity"},"content":{"rendered":"<p>A significant security vulnerability has been identified in n8n-MCP, an MCP server designed to provide AI assistants with access to n8n node documentation, properties, and operations. This flaw, tracked as CVE-2026-55608, could allow unauthorized access to sensitive workflow backup data in certain multi-tenant configurations.<\/p>\n<h2>CVE Details<\/h2>\n<p><strong>Product:<\/strong> n8n-MCP<\/p>\n<p><strong>Published:<\/strong> July 15, 2026<\/p>\n<p><strong>Severity:<\/strong> Medium<\/p>\n<p><strong>Status:<\/strong> Analyzed<\/p>\n<h2>Affected Products<\/h2>\n<p>The vulnerability impacts versions of n8n-MCP prior to <strong>2.57.4<\/strong>. Specifically, deployments configured for multi-tenant HTTP mode with the <code>ENABLE_MULTI_TENANT=true<\/code> setting are at risk.<\/p>\n<h2>Current Status<\/h2>\n<p>This vulnerability has been officially analyzed. A fix has been released, and users are strongly encouraged to update their installations.<\/p>\n<h2>Severity Level<\/h2>\n<p>Rated as <strong>Medium<\/strong>, this vulnerability could allow an authenticated tenant to bypass intended access restrictions. In vulnerable versions, an attacker could access or even delete workflow-version backups that belong to the default system scope, rather than being confined to their own tenant&#8217;s data. This improper access control exposes potentially sensitive information from prior single-tenant deployments or migrations.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The good news is that a patch is available. Users of affected n8n-MCP installations should upgrade to version <strong>2.57.4<\/strong> or later immediately.<\/p>\n<p>The fix addresses the issue by enforcing stricter authorization checks in multi-tenant HTTP mode. Previously, a request missing either the <code>x-n8n-url<\/code> or <code>x-n8n-key<\/code> header could inadvertently gain access to default-scope backups. Version 2.57.4 ensures that for multi-tenant setups, both of these tenant-specific headers must be present and valid for any request attempting to access workflow version backups. This prevents incomplete or partial tenant contexts from being able to view or manipulate sensitive data outside of their designated scope.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/commit\/1f42899749ed0c584fb6b4fd63d75233c3edee59<\/p>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/releases\/tag\/v2.57.4<\/p>\n<p>https:\/\/github.com\/czlonkowski\/n8n-mcp\/security\/advisories\/GHSA-2cf7-hpwf-47h9<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A significant security vulnerability has been identified in n8n-MCP, an MCP server designed to provide AI assistants with access to n8n node documentation, properties, and operations. This flaw, tracked as CVE-2026-55608, could allow unauthorized access to sensitive workflow backup data in certain multi-tenant configurations. CVE Details Product: n8n-MCP Published: July 15, 2026 Severity: Medium Status: [&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":[782,761,1219,1083,765],"class_list":["post-3937","post","type-post","status-publish","format-standard","hentry","category-security","tag-access-control","tag-data-exposure","tag-multi-tenant","tag-n8n-mcp","tag-security-update"],"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 Data Exposure Vulnerability (CVE-2026-55608) \u2014 Medium 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-data-exposure-vulnerability-cve-2026-55608-medium-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"n8n-MCP Data Exposure Vulnerability (CVE-2026-55608) \u2014 Medium Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"A significant security vulnerability has been identified in n8n-MCP, an MCP server designed to provide AI assistants with access to n8n node documentation, properties, and operations. This flaw, tracked as CVE-2026-55608, could allow unauthorized access to sensitive workflow backup data in certain multi-tenant configurations. 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