{"apiVersion":"1.0","identifier":"CVE-2026-46355","description":"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. 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.","publishedAt":"2026-08-20T22:17:19","lastModifiedAt":"2026-08-25T16:16:53","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46355","cvssScore":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","epssProbability":0.0021,"riskScore":0.72,"affectedProduct":"BigBlueButton","affectedVersions":"<3.0.23","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-46355","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-46355","en":"https://www.redsauce.net/en/cves/CVE-2026-46355","fr":"https://www.redsauce.net/fr/cves/CVE-2026-46355","pt":"https://www.redsauce.net/pt/cves/CVE-2026-46355","de":"https://www.redsauce.net/de/cves/CVE-2026-46355","sk":"https://www.redsauce.net/sk/cves/CVE-2026-46355","el":"https://www.redsauce.net/el/cves/CVE-2026-46355"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-46355"}}