CVE-2026-27737— BigBlueButton has Stored XSS in bbb-playback replay
Possible ATT&CK Techniques 1AI
T1059.007 · JavaScriptAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bigbluebutton | bbb-playback | < 5.4.3 | affected |
| bigbluebutton | bigbluebutton | < 3.0.19 | affected |
| blindsidenetworks | scalite | < 1.7.0 | affected |
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I. Basic Information for CVE-2026-27737
Vulnerability Information
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Vulnerability Title
BigBlueButton has Stored XSS in bbb-playback replay
Source: NVD (National Vulnerability Database)
Vulnerability Description
BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
BigBlueButton 跨站脚本漏洞
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 3.0.19之前版本存在跨站脚本漏洞，该漏洞源于录制回放未清理公共聊天中的用户输入，可能导致跨站脚本攻击。
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 | < 3.0.19 | - | |
| blindsidenetworks | scalite | < 1.7.0 | - | |
| bigbluebutton | bbb-playback | < 5.4.3 | - |
II. Public POCs for CVE-2026-27737
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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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-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
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-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiControll - CVE-2026-27467
BigBlueButton: Audio from participants to the server initial - CVE-2026-27466
BigBlueButton: Exposed ClamAV port enables Denial of Service
Same weakness: CWE-79
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AI Chatbot & Workflow Automation by AIWU <= 1.4.14 - Unauthe - CVE-2026-7460
mailcow-dockerized 2026-03b - Stored XSS in Queue Manager vi - CVE-2026-6549
Logo Manager For Enamad <= 0.7.4 - Authenticated (Contributo - CVE-2026-8038
Faces of Users <= 0.0.3 - Authenticated (Contributor+) Store
V. Comments for CVE-2026-27737
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