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CVE-2025-55200— BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes

Quick assessment

Affected
bigbluebutton bigbluebutton
Exploitation
Public or AI PoC available; prioritize validation
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 3.0.13之前版本存在跨站脚本漏洞，该漏洞源于共享笔记功能中用户名字段输入清理不当，可能导致存储型跨站脚本攻击。

CVSS 7.1 · High EPSS 0.24% · P14
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I. Basic Information for CVE-2025-55200

Vulnerability Information
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Vulnerability Title
BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary JavaScript in the context of higher-privileged users (e.g., Admins) who open the Shared Notes page. Version 3.0.13 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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 3.0.13之前版本存在跨站脚本漏洞，该漏洞源于共享笔记功能中用户名字段输入清理不当，可能导致存储型跨站脚本攻击。
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 < 3.0.13 -

II. Public POCs for CVE-2025-55200

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6625 chars
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2025-55200

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Same Patch Batch · bigbluebutton · 2025-10-09 · 3 CVEs total

CVE-2025-61602 7.5 HIGH BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
CVE-2025-61601 7.5 HIGH BigBlueButton vulnerable to DoS via PollSubmitVote GraphQL mutation

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-79

V. Comments for CVE-2025-55200

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