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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (33.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Bigbluebutton — versions 2.7.0, < 2.6.11, >= 2.7.0-alpha.1, < 2.7.0-beta.3
Weakness classification (CWE)
References
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x (Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/pull/18392 (Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234… (Patch, Third Party Advisory)
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.