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      <title>CVE-2026-105867 — Payload: Client uploads could overwrite S3 objects</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-105867</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; payloadcms payload, @payloadcms storage-s3&lt;/p&gt;
&lt;p&gt;Payload is a free and open source headless content management system. In @payloadcms/storage-s3 versions before 3.90.0 and canary versions before 4.0.0-canary.34, an authenticated user can overwrite an existing S3 object belonging to another upload collection when client uploads are enabled for multiple collections sharing a bucket and useCompositePrefixes is false or unset. This bypasses the target collection&amp;#39;s access controls and prior file validation. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; payloadcms payload, @payloadcms storage-s3&lt;/p&gt;
&lt;p&gt;Payload is a free and open source headless content management system. In @payloadcms/storage-s3 versions before 3.90.0 and canary versions before 4.0.0-canary.34, an authenticated user can overwrite an existing S3 object belonging to another upload collection when client uploads are enabled for multiple collections sharing a bucket and useCompositePrefixes is false or unset. This bypasses the target collection&amp;#39;s access controls and prior file validation. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.&lt;/p&gt;</content:encoded>
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