CVE-2026-27737
6.5 MEDIUMBigBlueButton is an open-source virtual classroom
Published: 2026-05-18 · Last updated: 2026-05-19
Severity and scoring
- CVSS
- 6.5 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- CWE
- CWE-79
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-27737
- [Other]https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1
- [Other]https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc
- [Other]https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
- [Other]https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv
- [Other]https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
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