Medium severity5.4NVD Advisory· Published Aug 20, 2026· Updated Sep 16, 2026
CVE-2026-55491
CVE-2026-55491
Description
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.
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Affected products
1- Range: <3.0.29
Patches
Vulnerability mechanics
References
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