CVE-2020-27604 json
BigBlueButton before 2.3 does not implement LibreOffice sandboxing.
published 2020-10-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20111
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
BigBlueButton before 2.3 does not implement LibreOffice sandboxing. This might make it easier for remote authenticated users to read the API shared secret in the bigbluebutton.properties file. With the API shared secret, an attacker can (for example) use api/join to join an arbitrary meeting regardless of its guestPolicy setting.
Patch / fix
- bigbluebutton bigbluebutton 2.2.8
Exploit prediction
1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- golem.de https://www.golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-116 Improper Encoding or Escaping of Output
References
-
golem.de
/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
exploit, third-party-advisory
-
docs.bigbluebutton.org
/dev/api.html
product
Sources
- CVE List CVE-2020-27604
- NVD CVE-2020-27604
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