{"id":3503,"date":"2026-03-20T07:31:22","date_gmt":"2026-03-20T07:31:22","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/"},"modified":"2026-03-20T07:31:22","modified_gmt":"2026-03-20T07:31:22","slug":"openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/","title":{"rendered":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity"},"content":{"rendered":"<h2>Understanding the OpenClaw Webhook Replay Vulnerability<\/h2>\n<p>A significant security flaw, identified as CVE-2026-28449, has been discovered in OpenClaw for Node.js. This vulnerability could allow attackers to manipulate webhook events, potentially leading to data integrity and availability problems within systems using affected versions.<\/p>\n<h2>CVE Details<\/h2>\n<p><strong>CVE ID:<\/strong> CVE-2026-28449<\/p>\n<p><strong>Product Name:<\/strong> OpenClaw (specifically for Node.js applications)<\/p>\n<p><strong>Published Date:<\/strong> March 19, 2026<\/p>\n<p><strong>Severity:<\/strong> Medium<\/p>\n<p><strong>Status:<\/strong> Analyzed<\/p>\n<h2>Affected Products<\/h2>\n<p>This vulnerability impacts versions of OpenClaw for Node.js that are older than <strong>2026.2.25<\/strong>. If you are using any version of OpenClaw prior to 2026.2.25 in your Node.js environment, your system may be at risk.<\/p>\n<h2>Current Status<\/h2>\n<p>The vulnerability has been officially &#8220;Analyzed.&#8221; This means it has been investigated and documented, and a fix is available.<\/p>\n<h2>Severity Level<\/h2>\n<p>Rated as <strong>Medium<\/strong> severity, this flaw indicates a notable risk. The vulnerability allows an attacker to replay previously valid and signed Nextcloud Talk webhook requests. Without proper suppression of these replayed requests, systems could process duplicate inbound messages. This could lead to incorrect data, system malfunctions, or even denial-of-service conditions, impacting the integrity and availability of your applications.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The good news is that a fix for this vulnerability is available. Users of OpenClaw for Node.js are strongly advised to update their installations to version <strong>2026.2.25<\/strong> or newer. This update introduces durable replay state for Nextcloud Talk webhook events, ensuring that valid signed requests cannot be replayed without detection and suppression. Promptly applying this update is crucial to protect your systems from potential attacks.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/openclaw\/openclaw\/commit\/d512163d686ad6741783e7119ddb3437f493dbbc<\/p>\n<p>https:\/\/github.com\/openclaw\/openclaw\/security\/advisories\/GHSA-r9q5-c7qc-p26w<\/p>\n<p>https:\/\/www.vulncheck.com\/advisories\/openclaw-webhook-replay-attack-via-missing-durable-replay-suppression<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding the OpenClaw Webhook Replay Vulnerability A significant security flaw, identified as CVE-2026-28449, has been discovered in OpenClaw for Node.js. This vulnerability could allow attackers to manipulate webhook events, potentially leading to data integrity and availability problems within systems using affected versions. CVE Details CVE ID: CVE-2026-28449 Product Name: OpenClaw (specifically for Node.js applications) Published [&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":[732,1061,1062,1064,1063],"class_list":["post-3503","post","type-post","status-publish","format-standard","hentry","category-security","tag-cybersecurity","tag-node-js","tag-openclaw","tag-replay-attack","tag-webhook-security"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \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\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"Understanding the OpenClaw Webhook Replay Vulnerability A significant security flaw, identified as CVE-2026-28449, has been discovered in OpenClaw for Node.js. This vulnerability could allow attackers to manipulate webhook events, potentially leading to data integrity and availability problems within systems using affected versions. CVE Details CVE ID: CVE-2026-28449 Product Name: OpenClaw (specifically for Node.js applications) Published [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/\" \/>\n<meta property=\"og:site_name\" content=\"Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-20T07:31:22+00:00\" \/>\n<meta name=\"author\" content=\"Alex Joseph\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Alex Joseph\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/\"},\"author\":{\"name\":\"Alex Joseph\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#\\\/schema\\\/person\\\/1ba9bfab02a76dee216c9f55bb634e56\"},\"headline\":\"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity\",\"datePublished\":\"2026-03-20T07:31:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/\"},\"wordCount\":289,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#organization\"},\"keywords\":[\"Cybersecurity\",\"Node.js\",\"OpenClaw\",\"Replay Attack\",\"Webhook Security\"],\"articleSection\":[\"Security\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/\",\"name\":\"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity - Web Hosting and IT Consultancy Services\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#website\"},\"datePublished\":\"2026-03-20T07:31:22+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#website\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/\",\"name\":\"Web Hosting and IT Consultancy Services\",\"description\":\"Discover the Potential of Digital Transformation through Effortless Hosting and Professional IT Consulting!\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#organization\",\"name\":\"Web Hosting and IT Consultancy Services\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/ucartzLogo-1.png\",\"contentUrl\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/ucartzLogo-1.png\",\"width\":165,\"height\":50,\"caption\":\"Web Hosting and IT Consultancy Services\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#\\\/schema\\\/person\\\/1ba9bfab02a76dee216c9f55bb634e56\",\"name\":\"Alex Joseph\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g\",\"caption\":\"Alex Joseph\"},\"description\":\"Alex Joseph is a Senior Support Staff professional with deep experience in server management, web hosting technologies, and cybersecurity operations. He works daily with Linux servers, cloud platforms, performance tuning, and security hardening, giving him strong real-world technical knowledge. Along with his support role, he write about security best practices, hosting infrastructure, and software management.\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/author\\\/alexjoseph\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity - Web Hosting and IT Consultancy Services","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/","og_locale":"en_US","og_type":"article","og_title":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity - Web Hosting and IT Consultancy Services","og_description":"Understanding the OpenClaw Webhook Replay Vulnerability A significant security flaw, identified as CVE-2026-28449, has been discovered in OpenClaw for Node.js. This vulnerability could allow attackers to manipulate webhook events, potentially leading to data integrity and availability problems within systems using affected versions. CVE Details CVE ID: CVE-2026-28449 Product Name: OpenClaw (specifically for Node.js applications) Published [&hellip;]","og_url":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/","og_site_name":"Web Hosting and IT Consultancy Services","article_published_time":"2026-03-20T07:31:22+00:00","author":"Alex Joseph","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Alex Joseph","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/#article","isPartOf":{"@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/"},"author":{"name":"Alex Joseph","@id":"https:\/\/www.ucartz.com\/updates\/#\/schema\/person\/1ba9bfab02a76dee216c9f55bb634e56"},"headline":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity","datePublished":"2026-03-20T07:31:22+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/"},"wordCount":289,"commentCount":0,"publisher":{"@id":"https:\/\/www.ucartz.com\/updates\/#organization"},"keywords":["Cybersecurity","Node.js","OpenClaw","Replay Attack","Webhook Security"],"articleSection":["Security"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/","url":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/","name":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity - Web Hosting and IT Consultancy Services","isPartOf":{"@id":"https:\/\/www.ucartz.com\/updates\/#website"},"datePublished":"2026-03-20T07:31:22+00:00","breadcrumb":{"@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.ucartz.com\/updates\/openclaw-webhook-replay-vulnerability-cve-2026-28449-medium-severity\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ucartz.com\/updates\/"},{"@type":"ListItem","position":2,"name":"OpenClaw Webhook Replay Vulnerability (CVE-2026-28449) \u2014 Medium Severity"}]},{"@type":"WebSite","@id":"https:\/\/www.ucartz.com\/updates\/#website","url":"https:\/\/www.ucartz.com\/updates\/","name":"Web Hosting and IT Consultancy Services","description":"Discover the Potential of Digital Transformation through Effortless Hosting and Professional IT Consulting!","publisher":{"@id":"https:\/\/www.ucartz.com\/updates\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ucartz.com\/updates\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.ucartz.com\/updates\/#organization","name":"Web Hosting and IT Consultancy Services","url":"https:\/\/www.ucartz.com\/updates\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.ucartz.com\/updates\/#\/schema\/logo\/image\/","url":"https:\/\/www.ucartz.com\/updates\/wp-content\/uploads\/2025\/12\/ucartzLogo-1.png","contentUrl":"https:\/\/www.ucartz.com\/updates\/wp-content\/uploads\/2025\/12\/ucartzLogo-1.png","width":165,"height":50,"caption":"Web Hosting and IT Consultancy Services"},"image":{"@id":"https:\/\/www.ucartz.com\/updates\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.ucartz.com\/updates\/#\/schema\/person\/1ba9bfab02a76dee216c9f55bb634e56","name":"Alex Joseph","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/0969fa5fefa2739cbd6fd5eaf04fed619e19f40d42e4a42650090606944ff747?s=96&d=mm&r=g","caption":"Alex Joseph"},"description":"Alex Joseph is a Senior Support Staff professional with deep experience in server management, web hosting technologies, and cybersecurity operations. He works daily with Linux servers, cloud platforms, performance tuning, and security hardening, giving him strong real-world technical knowledge. Along with his support role, he write about security best practices, hosting infrastructure, and software management.","url":"https:\/\/www.ucartz.com\/updates\/author\/alexjoseph\/"}]}},"_links":{"self":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts\/3503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/comments?post=3503"}],"version-history":[{"count":0,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/posts\/3503\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/media?parent=3503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/categories?post=3503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ucartz.com\/updates\/wp-json\/wp\/v2\/tags?post=3503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}