CVE-2023-42803

Name: CVE-2023-42803
Creator: NVD / NIST
Published: 2023-10-30T19:15:07.963+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2023-42803 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.54%

41.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions	Update
Bigbluebutton	Bigbluebutton	<= 2.5.18	—
Bigbluebutton	Bigbluebutton	2.6.0	Alpha1

References

https://github.com/bigbluebutton/bigbluebutton/pull/15990Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-w98f-6x8w-xhjcThird Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/15990Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-w98f-6x8w-xhjcThird Party Advisory

Timeline

Published: Oct 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-42803?

How severe is CVE-2023-42803?

CVE-2023-42803 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2023-42803?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-42803?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST