{"id":"CVE-2026-55489","title":"BigBlueButton is an open-source virtual classroom","summary":"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…","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L","cwe":["CWE-639"],"published":"2026-08-20","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:45.017","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55489","references":[{"url":"https://github.com/bigbluebutton/bigbluebutton/commit/c9e93f9af07b9661e286d101b83cbccb891c551f","label":"security-advisories@github.com"},{"url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29","label":"security-advisories@github.com"},{"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-jxpq-r3h3-p75g","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00193,"epssPercentile":0.09216,"ingestedAt":"2026-09-16T13:56:12.596Z","slug":"CVE-2026-55489","body":"## Overview\n\nBigBlueButton 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's meeting identifier before deletion, allowing a presenter who knew the identifier to delete another meeting's presentation and disrupt its availability. This issue is fixed in version 3.0.29.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}