CVE-2026-55491
5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Summary
BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording. This issue is fixed in version 3.0.29.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.29 | affected |
Weaknesses
- CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
- https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a932404b1b
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
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