CVE-2026-27736— BigBlueButton has Open Redirect vulnerability in ApiController
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 3.0.20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。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-27736
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
BigBlueButton has Open Redirect vulnerability in ApiController
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 3.0.20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 |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-27736
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same product: 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 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-601
-
CVE-2026-105128
LaraDashboard before 1.4.8 Open Redirect via Email Template -
CVE-2026-39600
WordPress Aculect AI Companion plugin <= 0.8.1 - Unvalidated -
CVE-2026-55252
OpenRun: Redirect URL validation bypass using //host paths -
CVE-2026-83589
Oauth-proxy: open redirect via /\ and /\t bypass in post-log -
CVE-2026-102090
Kiteworks Core content injection
V. Comments for CVE-2026-27736
No comments yet