CVE-2023-43798 json
BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)
published 2023-10-30 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-48170
- cvss
- 5.6
- 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 41%
- public exploits
- 0
- none known
Summary
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to versions 2.6.12 and 2.7.0-rc.1 is vulnerable to Server-Side Request Forgery (SSRF). This issue is a bypass of CVE-2023-33176. A patch in versions 2.6.12 and 2.7.0-rc.1 disabled follow redirect at `httpclient.execute` since the software no longer has to follow it when using `finalUrl`. There are no known workarounds. We recommend upgrading to a patched version of BigBlueButton.
Patch / fix
- bigbluebutton bigbluebutton 2.6.12
- github.com/bigbluebutton/bigbluebutton#18494 pull request
- github.com/bigbluebutton/bigbluebutton#18580 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.6 | CVSS:3.1/AV:N/AC:H/PR:N/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:N/S:U/C:L/I:L/A:N |
Affected products
- bigbluebutton bigbluebutton
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/bigbluebutton/bigbluebutton/pull/18494
third-party-advisory
-
github.com
/bigbluebutton/bigbluebutton/pull/18580
third-party-advisory
-
github.com
/bigbluebutton/bigbluebutton/security/advisories/GHSA-h98v-2h8w-99c4
third-party-advisory
-
github.com
/bigbluebutton/bigbluebutton/security/advisories/GHSA-3q22-hph2-cff7
third-party-advisory
Sources
- CVE List CVE-2023-43798
- NVD CVE-2023-43798
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