{"id":3644,"date":"2026-06-03T20:01:22","date_gmt":"2026-06-03T20:01:22","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/nextcloud-server-calendar-takeover-vulnerability-cve-2026-45281-high-severity\/"},"modified":"2026-06-03T20:01:28","modified_gmt":"2026-06-03T20:01:28","slug":"nextcloud-server-calendar-takeover-vulnerability-cve-2026-45281-high-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/nextcloud-server-calendar-takeover-vulnerability-cve-2026-45281-high-severity\/","title":{"rendered":"Nextcloud Server Calendar Takeover Vulnerability (CVE-2026-45281) \u2014 High Severity"},"content":{"rendered":"<h2>Understanding the Nextcloud Calendar Vulnerability<\/h2>\n<p>A significant security flaw has been identified in Nextcloud Server, an open-source platform widely used for content collaboration. This vulnerability, tracked as CVE-2026-45281, could allow an authenticated attacker to gain full, unauthorized access to another user&#8217;s calendar. This means an attacker could view, modify, and potentially delete sensitive calendar entries, severely impacting user privacy and data integrity.<\/p>\n<p>The root cause lies in inadequate authorization controls within the calendar&#8217;s backend. For an attack to succeed, the malicious actor would need to know the target user&#8217;s principal URL, but crucially, they must also be an authenticated user on the Nextcloud instance.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>CVE ID:<\/strong> CVE-2026-45281<\/li>\n<li><strong>Published Date:<\/strong> June 1, 2026<\/li>\n<li><strong>Severity:<\/strong> High<\/li>\n<li><strong>Status:<\/strong> Analyzed<\/li>\n<\/ul>\n<h2>Affected Products<\/h2>\n<p>This vulnerability impacts several versions of Nextcloud Server and Nextcloud Enterprise Server:<\/p>\n<ul>\n<li><strong>Nextcloud Server:<\/strong> Versions 32.0.0 up to, but not including, 32.0.9, and versions 33.0.0 up to, but not including, 33.0.3.<\/li>\n<li><strong>Nextcloud Enterprise Server:<\/strong> All versions from 21.0.0 up to, but not including, 21.0.9.23; 22.0.0 up to, but not including, 22.2.10.39; 23.0.0 up to, but not including, 23.0.12.35; 24.0.0 up to, but not including, 24.0.12.34; 25.0.0 up to, but not including, 25.0.13.29; 26.0.0 up to, but not including, 26.0.13.26; 27.0.0 up to, but not including, 27.1.11.26; 28.0.0 up to, but not including, 28.0.14.17; 29.0.0 up to, but not including, 29.0.16.16; 30.0.0 up to, but not including, 30.0.17.9; 31.0.0 up to, but not including, 31.0.14.5; 32.0.0 up to, but not including, 32.0.9; and 33.0.0 up to, but not including, 33.0.3.<\/li>\n<\/ul>\n<h2>Current Status<\/h2>\n<p>The vulnerability is currently &#8220;Analyzed,&#8221; meaning it has been thoroughly investigated and understood by security researchers and the vendor.<\/p>\n<h2>Severity Level<\/h2>\n<p>CVE-2026-45281 has been assigned a <strong>High<\/strong> severity rating with a CVSS score of 8.1. This high score is due to several factors:<\/p>\n<ul>\n<li><strong>Attack Vector:<\/strong> Network (meaning it can be exploited remotely over a network).<\/li>\n<li><strong>Attack Complexity:<\/strong> Low (making it relatively easy for an attacker to carry out).<\/li>\n<li><strong>Privileges Required:<\/strong> Low (an attacker only needs basic user privileges).<\/li>\n<li><strong>User Interaction:<\/strong> None (no user action is needed for the attack to work).<\/li>\n<li><strong>Confidentiality and Integrity:<\/strong> High impact (an attacker can fully access and alter private calendar data).<\/li>\n<\/ul>\n<p>The combination of these factors indicates a serious risk that could lead to significant data breaches and compromise of personal information for affected Nextcloud users.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>Nextcloud has released patches to address this vulnerability. It is strongly recommended to upgrade your Nextcloud installation immediately.<\/p>\n<ul>\n<li><strong>For Nextcloud Server:<\/strong> Upgrade to version 33.0.3 or 32.0.9.<\/li>\n<li><strong>For Nextcloud Enterprise Server:<\/strong> Upgrade to versions 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, 29.0.16.16, 28.0.14.17, 27.1.11.26, 26.0.13.26, 25.0.13.29, 24.0.12.34, 23.0.12.35, 22.2.10.39, or 21.0.9.23.<\/li>\n<\/ul>\n<h3>Workarounds (If immediate patching is not possible)<\/h3>\n<p>If you cannot apply the patches right away, Nextcloud suggests these temporary mitigation steps:<\/p>\n<ol>\n<li>Block access to the following endpoints:<code>remote.php\/dav\/principals\/users\/&lt;userid&gt;\/calendar-proxy-read<\/code><code>remote.php\/dav\/principals\/users\/&lt;userid&gt;\/calendar-proxy-write<\/code><\/li>\n<li>If you suspect data integrity issues or need to reset records, clear the <code>oc_dav_cal_proxy<\/code> table.<\/li>\n<\/ol>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-hrrv-mp25-26vv<\/p>\n<p>https:\/\/github.com\/nextcloud\/server\/pull\/59962<\/p>\n<p>https:\/\/hackerone.com\/reports\/3545964<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding the Nextcloud Calendar Vulnerability A significant security flaw has been identified in Nextcloud Server, an open-source platform widely used for content collaboration. This vulnerability, tracked as CVE-2026-45281, could allow an authenticated attacker to gain full, unauthorized access to another user&#8217;s calendar. This means an attacker could view, modify, and potentially delete sensitive calendar entries, [&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":[698,1124,800,770,1123],"class_list":["post-3644","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-authorization-bypass","tag-calendar-security","tag-data-privacy","tag-nextcloud","tag-nextcloud-server"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nextcloud Server Calendar Takeover Vulnerability (CVE-2026-45281) \u2014 High 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\/nextcloud-server-calendar-takeover-vulnerability-cve-2026-45281-high-severity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nextcloud Server Calendar Takeover Vulnerability (CVE-2026-45281) \u2014 High Severity - Web Hosting and IT Consultancy Services\" \/>\n<meta property=\"og:description\" content=\"Understanding the Nextcloud Calendar Vulnerability A significant security flaw has been identified in Nextcloud Server, an open-source platform widely used for content collaboration. This vulnerability, tracked as CVE-2026-45281, could allow an authenticated attacker to gain full, unauthorized access to another user&#8217;s calendar. 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