CVE-2023-43797

Name: CVE-2023-43797
Creator: NVD / NIST
Published: 2023-10-30T23:15:08.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2023-43797 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby messages starting in versions 2.6.11 and 2.7.0-beta.3. There are no known workarounds.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.42%

33.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Bigbluebutton	Bigbluebutton	< 2.6.11	—
Bigbluebutton	Bigbluebutton	2.7.0	Alpha1

References

https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9dPatch, Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18392Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73xThird Party Advisory
https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9dPatch, Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18392Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73xThird Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2023-43797?

How severe is CVE-2023-43797?

CVE-2023-43797 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2023-43797?

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-2023-43797?

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

Scan your code now

Source: NVD / NIST