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.

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Fixes

Solution

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Workaround

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History

Tue, 19 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 19 May 2026 08:45:00 +0000

Type Values Removed Values Added
First Time appeared Bigbluebutton
Bigbluebutton bbb-playback
Bigbluebutton bigbluebutton
Blindsidenetworks
Blindsidenetworks scalite
Vendors & Products Bigbluebutton
Bigbluebutton bbb-playback
Bigbluebutton bigbluebutton
Blindsidenetworks
Blindsidenetworks scalite

Mon, 18 May 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title BigBlueButton has Stored XSS in bbb-playback replay
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-19T12:11:53.931Z

Reserved: 2026-02-23T18:37:14.790Z

Link: CVE-2026-27737

cve-icon Vulnrichment

Updated: 2026-05-19T12:11:50.363Z

cve-icon NVD

Status : Deferred

Published: 2026-05-18T22:16:37.523

Modified: 2026-05-19T15:04:09.490

Link: CVE-2026-27737

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T08:18:35Z

Weaknesses