CVE-2026-27736— BigBlueButton has Open Redirect vulnerability in ApiController
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I. Basic Information for CVE-2026-27736
Vulnerability Information
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Vulnerability Title
BigBlueButton has Open Redirect vulnerability in ApiController
Source: NVD (National Vulnerability Database)
Vulnerability Description
BigBlueButton is an open-source virtual classroom. In versions on the 3.x branch prior to 3.0.20, the string received with errorRedirectUrl lacks validation, using it directly in the respondWithRedirect function leads to an Open Redirect vulnerability. BigBlueButton 3.0.20 patches the issue. No known workarounds are available.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: NVD (National Vulnerability Database)
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 3.0.20之前版本存在输入验证错误漏洞，该漏洞源于对errorRedirectUrl字符串缺乏验证，可能导致开放重定向攻击。
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 | >= 3.0.0, < 3.0.20 | - |
II. Public POCs for CVE-2026-27736
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service - CVE-2025-61602
BigBlueButton vulnerable to Chat DoS via invalid reactionEmo
Same vendor: bigbluebutton
- CVE-2026-41127
BigBlueButton's missing authorization allows viewer to injec - CVE-2026-41126
BigBlueButton has Open Redirect through bigbluebutton/api/jo - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service - CVE-2025-61602
BigBlueButton vulnerable to Chat DoS via invalid reactionEmo
Same weakness: CWE-601
- CVE-2026-42350
Kargo: Open Redirect in UI OIDC Login Flow via redirectTo Qu - CVE-2026-42195
Unvalidated gitlab URL parameter redirects OAuth authorize s - CVE-2026-3318
Multiple vulnerabilities in Cradle e-commerce - CVE-2026-42259
Saltcorn: Open Redirect in `POST /auth/login` due to incompl - CVE-2026-6795
Open Redirect in DivvyDrive Information Technologies' DivvyD
V. Comments for CVE-2026-27736
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