{"id":"CVE-2026-46355","title":"BigBlueButton is an open-source virtual classroom","summary":"BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/handleJoinExistingUser through bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy. …","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cwe":["CWE-287"],"published":"2026-08-20","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:43.933","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46355","references":[{"url":"https://github.com/bigbluebutton/bigbluebutton/commit/972b04e474e195cbd708b5b3f0485fe528a1a85b","label":"security-advisories@github.com"},{"url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.23","label":"security-advisories@github.com"},{"url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-38fw-2gq7-ccgr","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.0021,"epssPercentile":0.1146,"ingestedAt":"2026-09-16T13:56:12.595Z","slug":"CVE-2026-46355","body":"## Overview\n\nBigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/handleJoinExistingUser through bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy. A requester able to supply an existingUserID for an active participant could reuse that participant's session and impersonate the participant in the same meeting because handleJoinExistingUser was a routable controller action rather than a private helper. This issue is fixed in version 3.0.23.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}