XSS in Bigbluebutton

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (34.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

  • Bigbluebutton — versions 2.7.0, < 2.6.11, >= 2.7.0-alpha.1, < 2.7.0-beta.3

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-43797?
CVE-2023-43797 is a medium-severity vulnerability in Bigbluebutton, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2023-10-30.
How severe is CVE-2023-43797?
Medium severity. CVSS v3 base score is 6.3 out of 10.