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    <lastBuildDate>Wed, 07 Oct 2026 01:49:54 +0000</lastBuildDate>
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      <title>CVE-2026-55489 — BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-55489</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; bigbluebutton&lt;/p&gt;
&lt;p&gt;BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton presenters could submit a presentationId through /api/graphql that identified a presentation belonging to another meeting. akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/presentationpod/RemovePresentationPubMsgHdlr.scala did not verify the presentation&amp;#39;s meeting identifier before deletion, allowing a presenter who knew the identifier to delete another meeting&amp;#39;s presentation and disrupt its availability. This issue is fixed in version 3.0.29.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; bigbluebutton&lt;/p&gt;
&lt;p&gt;BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton presenters could submit a presentationId through /api/graphql that identified a presentation belonging to another meeting. akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/presentationpod/RemovePresentationPubMsgHdlr.scala did not verify the presentation&amp;#39;s meeting identifier before deletion, allowing a presenter who knew the identifier to delete another meeting&amp;#39;s presentation and disrupt its availability. This issue is fixed in version 3.0.29.&lt;/p&gt;</content:encoded>
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