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    <lastBuildDate>Wed, 07 Oct 2026 08:27:33 +0000</lastBuildDate>
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      <title>CVE-2026-56765 — Vikunja - Unauthenticated Instance-Wide Data Breach via Link Share Hash Disclosure Chained with Cross-Project Attachmen…</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-56765</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Vikunja&lt;/p&gt;
&lt;p&gt;Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exposes share hashes to users with read access, enabling permission escalation to admin-level shares. The GetTaskAttachment endpoint performs permission checks against user-supplied task IDs but fetches attachments by sequential ID without verifying ownership, allowing attackers to download and delete all file attachments across all projects instance-wide.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Vikunja&lt;/p&gt;
&lt;p&gt;Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exposes share hashes to users with read access, enabling permission escalation to admin-level shares. The GetTaskAttachment endpoint performs permission checks against user-supplied task IDs but fetches attachments by sequential ID without verifying ownership, allowing attackers to download and delete all file attachments across all projects instance-wide.&lt;/p&gt;</content:encoded>
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