High severity · published Oct 30, 2023
CVE-2023-42803
BigBlueButton Unrestricted File Upload vulnerability
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
bigbluebutton · bigbluebutton
< 2.6.0-beta.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-42803
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-42803
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/15990
Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-w98f-6x8w-xhjc
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