{"id":3729,"date":"2026-06-24T20:32:58","date_gmt":"2026-06-24T20:32:58","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/n8n-webhook-forgery-vulnerability-cve-2026-56357-medium-severity\/"},"modified":"2026-06-24T20:33:03","modified_gmt":"2026-06-24T20:33:03","slug":"n8n-webhook-forgery-vulnerability-cve-2026-56357-medium-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/n8n-webhook-forgery-vulnerability-cve-2026-56357-medium-severity\/","title":{"rendered":"n8n Webhook Forgery Vulnerability (CVE-2026-56357) \u2014 Medium Severity"},"content":{"rendered":"<p>A significant security flaw has been identified in n8n, a popular workflow automation tool. This vulnerability, tracked as CVE-2026-56357, affects the GitHub Webhook Trigger node within n8n. Simply put, it means that if someone knows the unique web address (URL) for your n8n GitHub webhook, they could trick your n8n workflows into running with fake data. This happens because the affected n8n versions do not properly check if the incoming data from GitHub is legitimate using a security feature called HMAC-SHA256 signature verification.<\/p>\n<p>This oversight could allow an attacker to send unauthorized information, making your n8n workflows execute actions with data that appears to come from GitHub but is actually malicious or spoofed. It&#8217;s like someone sending you a letter that looks exactly like it came from a trusted friend, but they wrote it themselves to trick you.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>Product Name:<\/strong> n8n<\/li>\n<li><strong>Published:<\/strong> June 22, 2026<\/li>\n<li><strong>Severity:<\/strong> Medium<\/li>\n<li><strong>Status:<\/strong> Analyzed<\/li>\n<\/ul>\n<h2>Affected Products<\/h2>\n<p>The vulnerability impacts n8n deployments using the GitHub Webhook Trigger node. Specifically, the affected versions are:<\/p>\n<ul>\n<li>All n8n versions prior to 1.123.15<\/li>\n<li>n8n versions from 2.0.0 up to, but not including, 2.5.0<\/li>\n<\/ul>\n<h2>Current Status<\/h2>\n<p>This vulnerability has been officially &#8220;Analyzed,&#8221; meaning its details and potential impact have been thoroughly reviewed and confirmed by security experts. The good news is that fixes are available.<\/p>\n<h2>Severity Level<\/h2>\n<p>Rated as &#8220;Medium&#8221; severity, this vulnerability presents a moderate risk. While it doesn&#8217;t typically allow an attacker to take full control of your system or steal sensitive data directly, it does enable them to manipulate workflows. By sending forged webhook requests, an attacker could trigger unintended actions, leading to data corruption, service disruption, or other negative consequences depending on what your n8n workflows are designed to do. For instance, a workflow meant to deploy code might be triggered with incorrect or harmful instructions, or data might be processed based on false pretenses.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>To protect your n8n instance from this webhook forgery vulnerability, it&#8217;s crucial to take immediate action:<\/p>\n<h3>Patches<\/h3>\n<p>The most effective solution is to update your n8n installation to a patched version. The issue has been officially resolved in:<\/p>\n<ul>\n<li><strong>n8n version 2.5.0<\/strong><\/li>\n<li><strong>n8n version 1.123.15<\/strong><\/li>\n<\/ul>\n<p>Users should upgrade to one of these versions or any later releases to ensure the vulnerability is remediated. Updating your software promptly is always the best defense against known security flaws.<\/p>\n<h3>Workarounds (Temporary Mitigations)<\/h3>\n<p>If an immediate upgrade is not feasible, you can implement the following temporary measures to reduce the risk. However, these are not complete fixes and should only be considered short-term solutions:<\/p>\n<ul>\n<li><strong>Limit Workflow Permissions:<\/strong> Restrict who can create and edit workflows in n8n to only those users you fully trust. This minimizes the chance of an attacker exploiting a misconfigured workflow.<\/li>\n<li><strong>Restrict Network Access:<\/strong> If possible, configure your network to only allow incoming connections to the n8n webhook endpoint from known GitHub webhook IP ranges. This helps prevent external attackers from reaching your webhook.<\/li>\n<\/ul>\n<p>It is important to remember that these workarounds do not fully eliminate the risk. Prioritize upgrading to the patched versions as soon as possible.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/n8n-io\/n8n\/security\/advisories\/GHSA-mqpr-49jj-32rc<\/p>\n<p>https:\/\/www.vulncheck.com\/advisories\/n8n-webhook-forgery-via-missing-hmac-sha256-signature-verification-in-github-webhook-trigger<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A significant security flaw has been identified in n8n, a popular workflow automation tool. This vulnerability, tracked as CVE-2026-56357, affects the GitHub Webhook Trigger node within n8n. Simply put, it means that if someone knows the unique web address (URL) for your n8n GitHub webhook, they could trick your n8n workflows into running with fake [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":3515,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[732,1155,1067,1154,1153],"class_list":["post-3729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-cybersecurity","tag-github-integration","tag-n8n","tag-software-vulnerability","tag-webhook-forgery"],"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 Webhook Forgery Vulnerability (CVE-2026-56357) \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-webhook-forgery-vulnerability-cve-2026-56357-medium-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"n8n Webhook Forgery Vulnerability (CVE-2026-56357) \u2014 Medium Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"A significant security flaw has been identified in n8n, a popular workflow automation tool. This vulnerability, tracked as CVE-2026-56357, affects the GitHub Webhook Trigger node within n8n. 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