CVE-2026-41126
Received Received - Intake
Open Redirect in BigBlueButton API Join Endpoint Prior to

Publication date: 2026-04-22

Last updated on: 2026-04-22

Assigner: GitHub, Inc.

Description
BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have an Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL." Version 3.0.24 has adjusted the handling of requests with incorrect checksum so that the default logoutURL is used. No known workarounds are available.
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Meta Information
Published
2026-04-22
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-14
NVD
CVE-2026-41126
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
bigbluebutton bigbluebutton to 3.0.24 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-601 The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
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Executive Summary

This vulnerability is an Open Redirect issue in BigBlueButton versions prior to 3.0.24. It occurs through the API endpoint bigbluebutton/api/join via the get-parameter "logoutURL." An attacker could exploit this by manipulating the logoutURL parameter to redirect users to a malicious site.

In version 3.0.24, the handling of requests with incorrect checksums was adjusted so that the default logoutURL is used instead of the user-supplied one, mitigating the vulnerability.

Impact Analysis

The vulnerability can impact users by allowing attackers to redirect them to potentially malicious websites when they attempt to log out. This could lead to phishing attacks or other social engineering exploits.

The CVSS score of 4.3 indicates a low to medium severity, meaning the impact is limited to confidentiality with no impact on integrity or availability.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade BigBlueButton to version 3.0.24 or later, as this version has adjusted the handling of requests with incorrect checksum to use the default logoutURL, preventing the open redirect issue.

No known workarounds are available, so applying the update is the recommended immediate step.

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