Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b911
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2
FAQ
What is CVE-2026-46353?
CVE-2026-46353 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-46353?
CVE-2026-46353 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46353?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.