{"id":3682,"date":"2026-06-04T22:01:08","date_gmt":"2026-06-04T22:01:08","guid":{"rendered":"https:\/\/www.ucartz.com\/updates\/nextcloud-2fa-bypass-vulnerability-cve-2026-45691-medium-severity\/"},"modified":"2026-06-04T22:01:14","modified_gmt":"2026-06-04T22:01:14","slug":"nextcloud-2fa-bypass-vulnerability-cve-2026-45691-medium-severity","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/updates\/nextcloud-2fa-bypass-vulnerability-cve-2026-45691-medium-severity\/","title":{"rendered":"Nextcloud 2FA Bypass Vulnerability (CVE-2026-45691): Medium Severity"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>A notable security flaw has been found in Nextcloud Server, an open-source platform for content collaboration. This vulnerability allows an attacker to bypass the mandatory two-factor authentication (2FA) simply by reusing a specific session cookie. This cookie is generated right after a user enters their password but before they complete the 2FA step, like entering a code from an authenticator app. If this pre-2FA session cookie is captured, it can be used as a special key (Bearer token) to gain full read and write access to a user&#8217;s files and other data accessible via DAV endpoints, completely bypassing the extra layer of security that 2FA is meant to provide.<\/p>\n<h2>CVE Details<\/h2>\n<ul>\n<li><strong>Product:<\/strong> Nextcloud Server<\/li>\n<li><strong>Published Date:<\/strong> June 1, 2026<\/li>\n<li><strong>Severity:<\/strong> Medium<\/li>\n<li><strong>Status:<\/strong> Analyzed<\/li>\n<\/ul>\n<h2>Affected Products<\/h2>\n<p>The vulnerability affects several versions of Nextcloud Server and Nextcloud Enterprise Server. Users should check if their installations fall within these ranges:<\/p>\n<ul>\n<li><strong>Nextcloud Server:<\/strong> All versions from 32.0.0 up to, but not including, 32.0.9. Also, all versions from 33.0.0 up to, but not including, 33.0.3.<\/li>\n<li><strong>Nextcloud Enterprise Server:<\/strong>\n<ul>\n<li>All versions from 29.0.0 up to, but not including, 29.0.16.16.<\/li>\n<li>All versions from 30.0.0 up to, but not including, 30.0.17.9.<\/li>\n<li>All versions from 31.0.0 up to, but not including, 31.0.14.5.<\/li>\n<li>All versions from 32.0.0 up to, but not including, 32.0.9.<\/li>\n<li>All versions from 33.0.0 up to, but not including, 33.0.3.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>Current Status<\/h2>\n<p>This vulnerability, identified as CVE-2026-45691, has been fully analyzed. The details, impact, and solutions have been thoroughly investigated and documented by the Nextcloud security team.<\/p>\n<h2>Severity Level<\/h2>\n<p>Rated as <strong>Medium<\/strong> severity with a CVSS score of 5.9. This rating indicates that while the vulnerability is significant, it might require specific conditions or a certain level of attacker skill to exploit. However, a successful exploit could lead to unauthorized read and write access to sensitive data, making it a serious concern for all Nextcloud users, especially those relying on 2FA for enhanced security.<\/p>\n<h2>Possible Solutions<\/h2>\n<p>Nextcloud has released patches to address this vulnerability. It is highly recommended to upgrade your Nextcloud installation immediately to a patched version to protect against potential exploitation. There are currently no known workarounds for this issue, making timely updates critical.<\/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 version 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9, or 29.0.16.16.<\/li>\n<\/ul>\n<h2>References<\/h2>\n<ul>\n<li>https:\/\/github.com\/nextcloud\/security-advisories\/security\/advisories\/GHSA-mp6x-g55j-w9jw<\/li>\n<li>https:\/\/github.com\/nextcloud\/server\/pull\/59758<\/li>\n<li>https:\/\/hackerone.com\/reports\/3573399<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Overview A notable security flaw has been found in Nextcloud Server, an open-source platform for content collaboration. This vulnerability allows an attacker to bypass the mandatory two-factor authentication<\/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":[1140,703,770,1139,695],"class_list":["post-3682","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-2fa-security","tag-authentication-bypass","tag-nextcloud","tag-session-hijacking","tag-web-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nextcloud 2FA Bypass Vulnerability - Ucartz Updates | Ucartz<\/title>\n<meta name=\"description\" content=\"Overview A notable security flaw has been found in Nextcloud Server, an open-source platform for content collaboration. 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