CVE-2026-27737

MediumCVSS 6.5/10Last modified Jul 24, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
bigbluebutton	bigbluebutton	< 3.0.19
blindsidenetworks	scalite	< 1.7.0
bigbluebutton	bbb-playback	< 5.4.3

References

Timeline

Published: May 18, 2026
Last modified: Jul 24, 2026
NVD status: Deferred

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