Arbitrary file upload in Bigbluebutton
CVE-2023-42803
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the insertDocument API call does not validate the given file extension before saving the file, and does not remove it in case of validation failures. BigBlueButton 2.6.0-beta.2 contains a patch. There are no known workarounds.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Bigbluebutton — versions 2.6.0, < 2.6.0-beta.2
Weakness classification (CWE)
References
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-w98f-6x8w-xhjc (Third Party Advisory)
- github.com/bigbluebutton/bigbluebutton/pull/15990 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-42803?
- CVE-2023-42803 is a medium-severity vulnerability in Bigbluebutton, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.3/10. Published 2023-10-30.
- How severe is CVE-2023-42803?
- Medium severity. CVSS v3 base score is 5.3 out of 10.