CVE-2023-43797

BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby

CVSS 6.3 MEDIUMEPSS 0.4%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.3EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

30 Oct 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

bigbluebutton · bigbluebutton

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References

https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d https://github.com/bigbluebutton/bigbluebutton/pull/18392 https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x