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      <title>CVE-2026-91973 — Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-91973</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; go-vikunja vikunja&lt;/p&gt;
&lt;p&gt;Vikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection. Remote unauthenticated attackers can issue unbounded credential-guessing requests against /dav, /.well-known, and /feeds routes to bypass the instance&amp;#39;s anti-brute-force controls and compromise password-only accounts.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; go-vikunja vikunja&lt;/p&gt;
&lt;p&gt;Vikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection. Remote unauthenticated attackers can issue unbounded credential-guessing requests against /dav, /.well-known, and /feeds routes to bypass the instance&amp;#39;s anti-brute-force controls and compromise password-only accounts.&lt;/p&gt;</content:encoded>
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