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      <title>CVE-2026-33425 — Discourse has inferable private group membership or existence via exclude_groups parameter</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-33425</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; discourse&lt;/p&gt;
&lt;p&gt;Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the `exclude_groups` parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; discourse&lt;/p&gt;
&lt;p&gt;Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the `exclude_groups` parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.&lt;/p&gt;</content:encoded>
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