VULNERABILITY INTELLIGENCE

CVE-2026-27737

CVSS score6.5 MEDIUM
EPSS probability0.26%
CISA KEVNot currently listed
Published2026-05-18
Last modified2026-07-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Description

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.

Weakness classification

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

Primary references