CVE-2026-41126— BigBlueButton has Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL"
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之前版本存在输入验证错误漏洞，该漏洞源于bigbluebutton/api/join中的get-parameter logoutURL存在开放重定向问题，可能导致重定向攻击。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-41126
Vulnerability Information
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Vulnerability Title
BigBlueButton has Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL"
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于bigbluebutton/api/join中的get-parameter logoutURL存在开放重定向问题，可能导致重定向攻击。
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-2026-41126
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Same vendor: bigbluebutton
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BigBlueButton: IDOR on BBB through /api/graphql via POST par -
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BigBlueButton: Stored XSS in Screenshare Recording Playback -
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BigBlueButton: Unauthenticated Session Hijack via Exposed /b -
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BigBlueButton: Blind SQL Injection AUTH (Moderator) -
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BigBlueButton API checksum bypass via presentationUploadExte
Same weakness: CWE-601
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V. Comments for CVE-2026-41126
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