Vulnerability Description
BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3
- https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj9
- https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
FAQ
What is CVE-2026-27737?
CVE-2026-27737 is a vulnerability with a CVSS score of 6.5 (MEDIUM). BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a maliciou...
How severe is CVE-2026-27737?
CVE-2026-27737 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27737?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.