CVE-2026-41127— BigBlueButton's missing authorization allows viewer to inject/overwrite captions
Quick assessment
Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.24之前版本存在安全漏洞，该漏洞源于缺少授权，允许查看者注入或覆盖字幕，可能导致权限提升。
Possible ATT&CK Techniques 1 AI
T1114 · Email Collection
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I. Basic Information for CVE-2026-41127
Vulnerability Information
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Vulnerability Title
BigBlueButton's missing authorization allows viewer to inject/overwrite captions
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.24之前版本存在安全漏洞，该漏洞源于缺少授权，允许查看者注入或覆盖字幕，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.24 | - |
|
II. Public POCs for CVE-2026-41127
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-55489
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Same vendor: bigbluebutton
-
CVE-2026-55489
BigBlueButton: IDOR on BBB through /api/graphql via POST par -
CVE-2026-55491
BigBlueButton: Stored XSS in Screenshare Recording Playback -
CVE-2026-46355
BigBlueButton: Unauthenticated Session Hijack via Exposed /b -
CVE-2026-46682
BigBlueButton: Blind SQL Injection AUTH (Moderator) -
CVE-2026-46353
BigBlueButton API checksum bypass via presentationUploadExte
Same weakness: CWE-639
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V. Comments for CVE-2026-41127
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