CVE-2023-43797

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.

• CWE-79

• https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9dPatch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/pull/18392Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73xThird Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9dPatch, Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/pull/18392Third Party Advisory
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73xThird Party Advisory

Published

Oct 30, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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