{"id":"CVE-2026-46353","summary":"BigBlueButton API checksum bypass via presentationUploadExternalUrl","details":"BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validation could be bypassed when a presentationUploadExternalUrl parameter was supplied to API request handling in CreateMeeting.java and ValidationService.java, allowing a user to send valid requests to some endpoints without a checksum. This issue is fixed in version 3.0.21.","aliases":["GHSA-43hc-5g2m-cqff"],"modified":"2026-07-18T03:47:12.348716739Z","published":"2026-07-16T18:06:54.645Z","database_specific":{"cwe_ids":["CWE-284"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46353.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46353.json"},{"type":"ADVISORY","url":"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46353"},{"type":"FIX","url":"https://github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b91184d5a8aea68b3d"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bigbluebutton/bigbluebutton","events":[{"introduced":"0"},{"fixed":"36fd1b407488a0c56ce620b91184d5a8aea68b3d"},{"fixed":"180cefe5727aea7493194223b1d9263f747a97ba"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.0.21"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v3.0.20","v3.0.19","v3.0.18","v3.0.17","v3.0.16","v3.0.15","v3.0.14","v3.0.13","v3.0.12","v3.0.11","v3.0.8","v3.0.10","v3.0.9","v3.0.7","v3.0.5","v3.0.4","v3.0.2","v3.0.3","v3.0.0","v3.0.1","v3.0.0-rc.4","v3.0.0-rc.3","v3.0.0-rc.2","v3.0.0-rc.1","3.0.0-rc.1","v3.0.0-beta.7","v3.0.0-beta.6","v3.0.0-beta.5","v3.0.0-beta.4","v3.0.0-beta.3","v3.0.0-beta.2","v3.0.0-beta.1","v3.0.0-alpha.7","v3.0.0-alpha.6","v3.0.0-alpha.4","v3.0.0-alpha.3","v3.0.0-alpha.2","v3.0.0-alpha.1","v2.4-beta-4","v2.4-beta-3","v2.4-beta-2","v2.4-beta-1","v2.4-alpha-1","v2.3.1","v2.3.0","v2.3-rc-2","v2.3-rc-1","v2.3-beta-5","v2.3-beta-4","v2.3-beta-3","v2.3-beta-2","v2.3-beta-1","v2.3-alpha-8","v2.3-alpha-7","v2.3-alpha-6","v2.3-alpha-5","v2.3-alpha-4","v2.3-alpha-3","v2.3-alpha-2","v2.3-alpha-1","2.2-rc-3","2.2-rc-2","2.2-rc-1","2.2-beta-23","2.2-beta-22","2.2-beta-21","2.2-beta-20","2.2-beta-19","2.2-beta-18","2.2-beta-17","2.2-beta-16","2.2-beta-15","2.2-beta-14","2.2-beta-12","2.2-beta-11","2.2-beta-10","2.2-beta-9","2.2-beta-8","2.2-beta-7","2.2-beta-6","2.2-beta-5","2.2-beta-4","2.2-beta-3","2.2-beta-2","dcs-2-a","v0.9.0-beta","v0.8","v0.8rc2","v0.8b4.0","v0.8b4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46353.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}