CVE-2026-41127

BigBlueButton's missing authorization allows viewer to inject/overwrite captions

MEDIUM

6.5

CVSS Score

Published: April 21, 2026 at 11:24 PM UTC

Updated: June 17, 2026 at 10:46 AM UTC

1 product affected across 1 vendorBigbluebutton

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have a missing authorization that allows viewers to inject/overwrite captions Version 3.0.24 tightened the permissions on who is able to submit captions. No known workarounds are available.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Bigbluebutton · Bigbluebutton

60%

v < 3.0.24

Affected range stops below 3.0.24, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-q387-2q28-mg33

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-639

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