{"id":2681,"date":"2025-12-11T13:31:10","date_gmt":"2025-12-11T13:31:10","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/nextcloud-desktop-information-disclosure-vulnerability-cve-2025-66549-low-severity\/"},"modified":"2025-12-11T13:31:21","modified_gmt":"2025-12-11T13:31:21","slug":"nextcloud-desktop-information-disclosure-vulnerability-cve-2025-66549-low-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/nextcloud-desktop-information-disclosure-vulnerability-cve-2025-66549-low-severity\/","title":{"rendered":"Nextcloud Desktop Information Disclosure Vulnerability (CVE-2025-66549): Low Severity"},"content":{"rendered":"<p>The Nextcloud Desktop client, designed to help users synchronize their files, recently had a privacy flaw. This issue, tracked as CVE-2025-66549, meant that when a user manually locked an end-to-end encrypted file, the file&#8217;s location was inadvertently transmitted to the server in an unencrypted format. Consequently, server administrators could potentially view these file paths in their log files, even though the file content itself remained encrypted.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>Product:<\/strong> Nextcloud Desktop<\/li>\n<li><strong>Published:<\/strong> December 5, 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>This vulnerability affects Nextcloud Desktop client versions earlier than 3.16.5. Users running any version prior to 3.16.5 are susceptible to this information disclosure issue.<\/p>\n<h2>Current Status<\/h2>\n<p>The vulnerability has been thoroughly analyzed and publicly disclosed, allowing users and administrators to take appropriate action.<\/p>\n<h2>Severity Level<\/h2>\n<p>CVE-2025-66549 is classified as a Low severity vulnerability. While the core encryption of the file content remains intact, the exposure of file paths to server administrators is a concern. For users relying on end-to-end encryption for the highest level of privacy, revealing even metadata like file locations undermines the expected confidentiality.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>The good news is that a fix is available. To mitigate this vulnerability, all users of the Nextcloud Desktop client should update their software to version 3.16.5 or newer as soon as possible. This update addresses the flaw by ensuring file paths are not inadvertently logged in an unencrypted manner during the manual file locking process.<\/p>\n<h2>References<\/h2>\n<p>https:\/\/github.com\/nextcloud\/desktop\/commit\/36d6c234d42b06a6f2e9de3e413a5c3c625edad6<\/p>\n<p>https:\/\/github.com\/nextcloud\/desktop\/pull\/8330<\/p>\n<p>https:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-h9xj-qh76-q3hw<\/p>\n<p>https:\/\/hackerone.com\/reports\/3159877<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Nextcloud Desktop client, designed to help users synchronize their files, recently had a privacy flaw. This issue, tracked as CVE-2025-66549, meant that when a user manually locked<\/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":[800,802,801,697,770],"class_list":["post-2681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-data-privacy","tag-desktop-client","tag-file-synchronization","tag-information-disclosure","tag-nextcloud"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nextcloud Desktop Information Disclosure - Ucartz | Ucartz<\/title>\n<meta name=\"description\" content=\"The Nextcloud Desktop client, designed to help users synchronize their files, recently had a privacy flaw. 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