{"id":2667,"date":"2025-12-11T10:29:21","date_gmt":"2025-12-11T10:29:21","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/nextcloud-calendar-blind-booking-vulnerability-cve-2025-66546-low-severity\/"},"modified":"2025-12-11T10:29:27","modified_gmt":"2025-12-11T10:29:27","slug":"nextcloud-calendar-blind-booking-vulnerability-cve-2025-66546-low-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/nextcloud-calendar-blind-booking-vulnerability-cve-2025-66546-low-severity\/","title":{"rendered":"Nextcloud Calendar Blind Booking Vulnerability (CVE-2025-66546): Low Severity"},"content":{"rendered":"<h2>A Closer Look at the Nextcloud Calendar Vulnerability<\/h2>\n<p>Nextcloud Calendar, a popular application for managing schedules within the Nextcloud ecosystem, has a security flaw that could allow unauthorized appointment booking. While the severity is rated as low, it\u2019s still important for users to be aware and take necessary precautions.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>Product:<\/strong> Nextcloud Calendar<\/li>\n<li><strong>Published:<\/strong> December 05, 2025<\/li>\n<li><strong>Severity:<\/strong> Low<\/li>\n<li><strong>Status:<\/strong> Analyzed<\/li>\n<\/ul>\n<h2>Affected Products<\/h2>\n<p>The vulnerability specifically impacts versions of the Nextcloud Calendar app prior to:<\/p>\n<ul>\n<li>4.7.19<\/li>\n<li>5.5.6<\/li>\n<li>6.0.1<\/li>\n<\/ul>\n<h2>Current Status<\/h2>\n<p>This vulnerability has been analyzed, and fixes are available in newer versions of the Nextcloud Calendar app. It is recommended to update to the patched versions as soon as possible.<\/p>\n<h2>Severity Level<\/h2>\n<p>The Common Vulnerability Scoring System (CVSS) rates this vulnerability as LOW, with a score of 3.3. This indicates a relatively minor risk, but it\u2019s always best practice to patch known vulnerabilities.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The vulnerability is fixed in Nextcloud Calendar versions 4.7.19, 5.5.6, and 6.0.1. Users are strongly advised to update their Nextcloud Calendar app to one of these versions or a later release to protect against this issue. Regularly updating your Nextcloud instance and its applications is a key part of maintaining a secure environment.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/nextcloud\/calendar\/commit\/f41650c3681fc4a4130eb883f5c0899c011326b3<br \/>\nhttps:\/\/github.com\/nextcloud\/calendar\/pull\/7537<br \/>\nhttps:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-7x2j-2674-fj95<br \/>\nhttps:\/\/hackerone.com\/reports\/3275810<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Closer Look at the Nextcloud Calendar Vulnerability Nextcloud Calendar, a popular application for managing schedules within the Nextcloud ecosystem, has a security flaw that could allow unauthorized<\/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":[787,770,765,696],"class_list":["post-2667","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-calendar-app","tag-nextcloud","tag-security-update","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nextcloud Calendar Blind Booking - Ucartz Updates | Ucartz<\/title>\n<meta name=\"description\" content=\"A Closer Look at the Nextcloud Calendar Vulnerability Nextcloud Calendar, a popular application for managing schedules within the Nextcloud ecosystem, has\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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