CVE-2023-43797 json
BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby
published 2023-10-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-48169
- cvss
- 6.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bigbluebutton bigbluebutton 2.6.11
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected products
- bigbluebutton bigbluebutton
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/bigbluebutton/bigbluebutton/pull/18392
third-party-advisory
-
github.com
/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d
patch, third-party-advisory
-
github.com
/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x
third-party-advisory
Sources
- CVE List CVE-2023-43797
- NVD CVE-2023-43797
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