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Vulnerability record · CVE-2023-43797 · published 30 October 2023

CVE-2023-43797: Bigbluebutton cross-site scripting vulnerability

Bigbluebutton · Bigbluebutton

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.

5.4 CVSS 3.1 Medium EPSS 0.42% · top 66.3% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d PatchThird Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18392 Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/commit/304bc851a00558f99a908880f4ac44234a074c9d PatchThird Party Advisory
https://github.com/bigbluebutton/bigbluebutton/pull/18392 Third Party Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-v6wg-q866-h73x Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-27602Bigbluebutton injection vulnerabilityBigBlueButton before 2.2.7 does not have a protection mechanism for separator injection in meetingId, userId, and authToken.EPSS 1.4%9.8CVE-2020-27605Bigbluebutton vulnerabilityBigBlueButton through 2.2.28 uses Ghostscript for processing of uploaded EPS documents, and consequently may be subject to attacks related to a "schw…EPSS 1.2%9.8CVE-2020-12443Bigbluebutton path traversal vulnerabilityBigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename (lowercase) value can be a .pdf filename while th…EPSS 3.7%8.8CVE-2023-42803Bigbluebutton unrestricted file upload vulnerabilityBigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the i…EPSS 0.54%8.4CVE-2020-27613Bigbluebutton cleartext storage of sensitive data vulnerabilityThe installation procedure in BigBlueButton before 2.2.28 (or earlier) uses ClueCon as the FreeSWITCH password, which allows local users to achieve u…EPSS 0.27%8.2CVE-2026-27466Bigbluebutton exposure of resource to wrong sphere vulnerabilityBigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for…EPSS 0.58%7.5CVE-2025-61601Bigbluebutton vulnerabilityBigBlueButton is an open-source virtual classroom. A Denial of Service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user …EPSS 0.47%7.5CVE-2025-61602Bigbluebutton vulnerabilityBigBlueButton is an open-source virtual classroom. A denial-of-service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user …EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2023-43797), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.