VULNERABILITY INTELLIGENCE

CVE-2026-55491

CVSS score5.4 MEDIUM
EPSS probability0.29%
CISA KEVNot currently listed
Published2026-08-20
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-79

Primary references