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    <lastBuildDate>Wed, 07 Oct 2026 20:16:26 +0000</lastBuildDate>
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      <title>CVE-2021-28799 — Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-28799</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; QNAP Systems Inc. HBS 3, QNAP Systems Inc. HBS 2, QNAP Systems Inc. HBS 1.3&lt;/p&gt;
&lt;p&gt;An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; QNAP Systems Inc. HBS 3, QNAP Systems Inc. HBS 2, QNAP Systems Inc. HBS 1.3&lt;/p&gt;
&lt;p&gt;An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .&lt;/p&gt;</content:encoded>
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