Description
BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby messages starting in versions 2.6.11 and 2.7.0-beta.3. There are no known workarounds.
References (3)
Core 3
Core References
Third Party Advisory x_refsource_confirm
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x
Third Party Advisory x_refsource_misc
https://github.com/bigbluebutton/bigbluebutton/pull/18392
Patch, Third Party Advisory x_refsource_misc
https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d
Scores
CVSS v3
6.3
EPSS
0.0042
EPSS Percentile
33.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
bigbluebutton/bigbluebutton
2.7.0 alpha1 (5 CPE variants)
bigbluebutton/bigbluebutton
< 2.6.11
Published
Oct 30, 2023
Tracked Since
Feb 18, 2026