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    <link>https://cve.radiocsirt.org</link>
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    <lastBuildDate>Fri, 09 Oct 2026 12:57:41 +0000</lastBuildDate>
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      <title>CVE-2026-57856 — Cockpit CMS Path Traversal via Bucket Name in Bucket File Storage API</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-57856</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Cockpit HQ Cockpit CMS&lt;/p&gt;
&lt;p&gt;Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace(&amp;#39;/[^a-zA-Z0-9-_\\.]/&amp;#39;,&amp;#39;&amp;#39;, $bucket), which permits &amp;#39;..&amp;#39; and &amp;#39;../&amp;#39; sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem&amp;#39;s WhitespacePathNormalizer resolves &amp;#39;buckets/..&amp;#39; to the empty string (the uploads storage root) without raising PathTraversalDetected because the &amp;#39;..&amp;#39; has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a &amp;#39;../&amp;#39; bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Cockpit HQ Cockpit CMS&lt;/p&gt;
&lt;p&gt;Cockpit CMS contains a path traversal vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php sanitizes the bucket name with preg_replace(&amp;#39;/[^a-zA-Z0-9-_\\.]/&amp;#39;,&amp;#39;&amp;#39;, $bucket), which permits &amp;#39;..&amp;#39; and &amp;#39;../&amp;#39; sequences. The sanitized value is interpolated into a Flysystem path as uploads://buckets/{bucket}. Flysystem&amp;#39;s WhitespacePathNormalizer resolves &amp;#39;buckets/..&amp;#39; to the empty string (the uploads storage root) without raising PathTraversalDetected because the &amp;#39;..&amp;#39; has a preceding component to consume. An authenticated low-privileged user can send a crafted request with a &amp;#39;../&amp;#39; bucket name to list, upload, and delete files across all buckets, including those belonging to other users or roles&lt;/p&gt;</content:encoded>
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