{"id":3559,"date":"2026-05-06T17:31:24","date_gmt":"2026-05-06T17:31:24","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\/"},"modified":"2026-05-06T17:31:26","modified_gmt":"2026-05-06T17:31:26","slug":"openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\/","title":{"rendered":"OpenClaw Nextcloud Talk Plugin Allowlist Bypass Vulnerability (CVE-2026-28474) \u2014 Critical Severity"},"content":{"rendered":"<p>A significant security flaw has been discovered in OpenClaw&#8217;s Nextcloud Talk plugin, identified as CVE-2026-28474. This vulnerability could allow unauthorized users to gain access to private direct messages and conference rooms by simply altering their display name. Rated as &#8216;Critical&#8217; severity, it&#8217;s crucial for users and administrators to understand this risk and implement the necessary protections immediately.<\/p>\n<p>The core of this issue lies in how the plugin verifies users against an &#8220;allowlist.&#8221; Instead of using unique, immutable user IDs, it mistakenly relied on changeable display names. This oversight created a loophole that malicious actors could exploit.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>Product Name:<\/strong> OpenClaw Nextcloud Talk plugin<\/li>\n<li><strong>Published Date:<\/strong> March 5, 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 vulnerability affects OpenClaw&#8217;s Nextcloud Talk plugin versions prior to 2026.2.6. Users running any version before this specific update are at risk.<\/p>\n<h2>Current Status<\/h2>\n<p>This vulnerability has been thoroughly analyzed, and a fix has been developed and released by OpenClaw. The information is publicly available, allowing affected parties to take action.<\/p>\n<h2>Severity Level<\/h2>\n<p>With a CVSS score of 9.8, CVE-2026-28474 is classified as <strong>CRITICAL<\/strong> severity. This high rating indicates that the vulnerability is easily exploitable and could lead to severe consequences, including unauthorized access to sensitive communications. An attacker could impersonate a legitimate user on an allowlist and join private discussions or channels without permission, compromising privacy and data integrity.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The good news is that OpenClaw has addressed this critical flaw. The primary solution is to update your Nextcloud Talk plugin to a secure version.<\/p>\n<ul>\n<li><strong>Upgrade to Version 2026.2.6 or later:<\/strong> Users of OpenClaw&#8217;s Nextcloud Talk plugin should immediately upgrade to version 2026.2.6 or any subsequent patched release. This update ensures that allowlist validations are correctly performed using stable user IDs rather than mutable display names.<\/li>\n<li><strong>Verify Patch Application:<\/strong> After applying the update, administrators should verify that the patch has been successfully implemented and that allowlist checks are functioning as intended, using user IDs for validation.<\/li>\n<\/ul>\n<h2>References<\/h2>\n<ul>\n<li>https:\/\/github.com\/openclaw\/openclaw\/commit\/6b4b6049b47c3329a7014509594647826669892d<\/li>\n<li>https:\/\/github.com\/openclaw\/openclaw\/security\/advisories\/GHSA-r5h9-vjqc-hq3r<\/li>\n<li>https:\/\/www.vulncheck.com\/advisories\/openclaw-nextcloud-talk-allowlist-bypass-via-actorname-display-name-spoofing<\/li>\n<\/ul>\n<p><strong>Suggested Internal Backlinks:<\/strong><\/p>\n<ul>\n<li>&#8220;Understanding Allowlist Security: A Comprehensive Guide&#8221;<\/li>\n<li>&#8220;Strengthening Your Digital Defenses: Best Practices for Plugin Security&#8221;<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A significant security flaw has been discovered in OpenClaw&#8217;s Nextcloud Talk plugin, identified as CVE-2026-28474. This vulnerability could allow unauthorized users to gain access to private direct messages and conference rooms by simply altering their display name. Rated as &#8216;Critical&#8217; severity, it&#8217;s crucial for users and administrators to understand this risk and implement the necessary [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":2652,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1088,732,807,1062,715],"class_list":["post-3559","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-allowlist-bypass","tag-cybersecurity","tag-nextcloud-talk","tag-openclaw","tag-plugin-vulnerability"],"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 Nextcloud Talk Plugin Allowlist Bypass Vulnerability (CVE-2026-28474) \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\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OpenClaw Nextcloud Talk Plugin Allowlist Bypass Vulnerability (CVE-2026-28474) \u2014 Critical Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"A significant security flaw has been discovered in OpenClaw&#8217;s Nextcloud Talk plugin, identified as CVE-2026-28474. This vulnerability could allow unauthorized users to gain access to private direct messages and conference rooms by simply altering their display name. Rated as &#8216;Critical&#8217; severity, it&#8217;s crucial for users and administrators to understand this risk and implement the necessary [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ucartz.com\/updates\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\/\" \/>\n<meta property=\"og:site_name\" content=\"Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-06T17:31:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-06T17:31:26+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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/\"},\"author\":{\"name\":\"Alex Joseph\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#\\\/schema\\\/person\\\/1ba9bfab02a76dee216c9f55bb634e56\"},\"headline\":\"OpenClaw Nextcloud Talk Plugin Allowlist Bypass Vulnerability (CVE-2026-28474) \u2014 Critical Severity\",\"datePublished\":\"2026-05-06T17:31:24+00:00\",\"dateModified\":\"2026-05-06T17:31:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/\"},\"wordCount\":382,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/NextCloud-Banner-Ucartz.webp\",\"keywords\":[\"Allowlist Bypass\",\"Cybersecurity\",\"Nextcloud Talk\",\"OpenClaw\",\"Plugin Vulnerability\"],\"articleSection\":[\"Security\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/\",\"url\":\"https:\\\/\\\/www.ucartz.com\\\/updates\\\/openclaw-nextcloud-talk-plugin-allowlist-bypass-vulnerability-cve-2026-28474-critical-severity\\\/\",\"name\":\"OpenClaw Nextcloud Talk Plugin Allowlist Bypass Vulnerability (CVE-2026-28474) \u2014 Critical Severity - 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