{"id":2669,"date":"2025-12-11T10:33:44","date_gmt":"2025-12-11T10:33:44","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/nextcloud-server-file-tagging-vulnerability-cve-2025-66547-medium-severity\/"},"modified":"2025-12-11T10:33:58","modified_gmt":"2025-12-11T10:33:58","slug":"nextcloud-server-file-tagging-vulnerability-cve-2025-66547-medium-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/nextcloud-server-file-tagging-vulnerability-cve-2025-66547-medium-severity\/","title":{"rendered":"Nextcloud Server File Tagging Vulnerability (CVE-2025-66547): Medium Severity"},"content":{"rendered":"<h2>A Closer Look at the Nextcloud File Tagging Issue<\/h2>\n<p>Nextcloud Server, a popular self-hosted cloud solution, has a vulnerability that could let regular users access or change file tags they shouldn&#8217;t be able to. Imagine someone adding a &#8220;confidential&#8221; tag to a file they don&#8217;t have permission to see \u2013 that&#8217;s the kind of thing this flaw could enable.<\/p>\n<p>This issue affects how users manage tags on files. Even without special privileges, a user could potentially alter tags on files that are outside their authorized access. While it doesn&#8217;t allow full access to the file content, it could expose sensitive information through improper tagging or aid in further attacks.<\/p>\n<p>## CVE Details<\/p>\n<p>*   **Product:** Nextcloud Server &#038; Nextcloud Enterprise Server<br \/>\n*   **Published:** December 05, 2025<br \/>\n*   **Severity:** Medium<br \/>\n*   **Status:** Analyzed<\/p>\n<p>## Affected Products<\/p>\n<p>This vulnerability specifically impacts Nextcloud Server and Nextcloud Enterprise Server versions prior to 31.0.1.<\/p>\n<p>## Current Status<\/p>\n<p>This vulnerability has been analyzed and addressed by the Nextcloud team.<\/p>\n<p>## Severity Level<\/p>\n<p>The vulnerability is rated as Medium, with a CVSS score of 4.3. This indicates a moderate level of risk, suggesting that while not critically severe, it warrants attention and timely patching.<\/p>\n<p>## Possible Solutions<\/p>\n<p>The Nextcloud team has released a fix for this vulnerability. Users are strongly advised to update their Nextcloud Server or Nextcloud Enterprise Server instances to version 31.0.1 or later. This update addresses the flaw in the file tagging mechanism, preventing unauthorized modifications.<\/p>\n<p>Applying security updates promptly is crucial for maintaining the integrity and security of your self-hosted cloud environment. Regularly checking for and applying patches from software vendors is a fundamental practice in cybersecurity.<\/p>\n<p>## References<\/p>\n<p>https:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-hq6c-r898-fgf2<br \/>\nhttps:\/\/github.com\/nextcloud\/server\/commit\/b44f1568f2dc97c746281d99e2342ad679e3d8a9<br \/>\nhttps:\/\/github.com\/nextcloud\/server\/issues\/51247<br \/>\nhttps:\/\/github.com\/nextcloud\/server\/pull\/51288<br \/>\nhttps:\/\/hackerone.com\/reports\/3040887<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Closer Look at the Nextcloud File Tagging Issue Nextcloud Server, a popular self-hosted cloud solution, has a vulnerability that could let regular users access or change file<\/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":[771,732,788,770,696],"class_list":["post-2669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-cloud-security","tag-cybersecurity","tag-file-management","tag-nextcloud","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 Server File Tagging - Ucartz Updates | Ucartz<\/title>\n<meta name=\"description\" content=\"A Closer Look at the Nextcloud File Tagging Issue Nextcloud Server, a popular self-hosted cloud solution, has a vulnerability that could let regular users\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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