CVE-2026-55491
Medium · CVSS 5.4Published 2026-08-20
CVSS
5.4
Medium
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is 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.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.
CVSS Score Explained
CVSS 5.4 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a932404b1b
- PATCHhttps://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
- ›https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
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