MEDIUM 5.4 NVD
CVE-2026-55491
BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index
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.
References
- https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a93240
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
This medium severity vulnerability with a CVSS score of 5.4 was published on 2026-08-20 via NVD.
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