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CVE-2026-27737

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CVE-2026-27737

Published: May 18, 2026

Modified: May 19, 2026

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

VendorProductVersions

bigbluebutton

bigbluebutton

affected
< 3.0.19

blindsidenetworks

scalite

affected
< 1.7.0

bigbluebutton

bbb-playback

affected
< 5.4.3

Weaknesses (CWE)

CWE-79

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

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