Platform
php
Component
bigbluebutton
Fixed in
3.0.25
CVE-2026-41127 affects BigBlueButton virtual classroom platforms versions 3.0.0 through 3.0.23. This vulnerability stems from a missing authorization check, enabling unauthorized viewers to inject or overwrite captions during sessions. The impact can range from minor disruptions to significant session hijacking, depending on the attacker's intent. Version 3.0.24 addresses this issue with tightened caption submission permissions.
The core impact of CVE-2026-41127 lies in the ability for unauthorized viewers to manipulate captions within a BigBlueButton session. An attacker could inject misleading or offensive text, disrupting the learning experience for other participants. More seriously, caption manipulation could be used to spread misinformation or impersonate presenters. While the vulnerability doesn't grant direct access to the server or other sensitive data, the disruption and potential for social engineering are significant. The blast radius extends to all participants in a session where this vulnerability is present, and the ease of exploitation makes it a concerning risk.
CVE-2026-41127 is not currently listed on the CISA KEV catalog. Public proof-of-concept exploits are not yet widely available, but the vulnerability's simplicity suggests a high probability of exploitation if it remains unpatched. The vulnerability was disclosed on 2026-04-21, indicating a relatively recent discovery. Active campaigns targeting this vulnerability are not currently confirmed, but the potential for disruption makes it a likely target.
Exploit Status
EPSS
0.02% (7% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-41127 is to upgrade BigBlueButton to version 3.0.24 or later. This version includes a critical fix that tightens permissions on caption submission, preventing unauthorized users from injecting or overwriting captions. Unfortunately, no workarounds are currently available for versions prior to 3.0.24. If an immediate upgrade is not possible, consider restricting access to caption submission to authorized users only through manual session management, though this is not a substitute for patching. After upgrading, verify the fix by attempting to submit a caption as a non-authorized viewer; the submission should be rejected.
Update BigBlueButton to version 3.0.24 or higher to mitigate the vulnerability. This version implements more restrictive permissions for caption submission, preventing unauthorized injection or overwriting.
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CVE-2026-41127 is a medium severity vulnerability in BigBlueButton versions 3.0.0 through 3.0.23 that allows unauthorized viewers to inject or overwrite captions due to a missing authorization check.
You are affected if you are running BigBlueButton versions 3.0.0 through 3.0.23. Upgrade to version 3.0.24 or later to mitigate the risk.
Upgrade BigBlueButton to version 3.0.24 or later. No workarounds are available for earlier versions.
Active exploitation is not currently confirmed, but the vulnerability's simplicity suggests a potential for exploitation.
Refer to the official BigBlueButton security advisory for detailed information and updates: [https://bigbluebutton.com/security/](https://bigbluebutton.com/security/)
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