CVE-2021-4143 json
Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton
published 2022-01-19 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-34012
- cvss
- 8.1
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
Cross-site Scripting (XSS) - Generic in GitHub repository bigbluebutton/bigbluebutton prior to 2.4.0.
Patch / fix
- bigbluebutton bigbluebutton/bigbluebutton 2.4.0
Exploit prediction
0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/e67603e6-8497-4ab6-b93a-02c26407d443 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- bigbluebutton bigbluebutton/bigbluebutton
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/bigbluebutton/bigbluebutton/commit/62040bdcb3c2f993ba72ab89f4db2015e18d1706
patch, third-party-advisory
-
huntr.dev
/bounties/e67603e6-8497-4ab6-b93a-02c26407d443
exploit, patch, third-party-advisory
Sources
- CVE List CVE-2021-4143
- NVD CVE-2021-4143
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