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CVE-2025-61602— BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId

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之前版本存在安全漏洞，该漏洞源于发送畸形的reactionEmojiId，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-61602

Vulnerability Information
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Vulnerability Title
BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. A denial-of-service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user to crash the chat functionality for all participants in a meeting by sending a malformed `reactionEmojiId` in the GraphQL mutation `chatSendMessageReaction`. Version 3.0.13 contains a patch. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 安全漏洞
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之前版本存在安全漏洞，该漏洞源于发送畸形的reactionEmojiId，可能导致拒绝服务攻击。
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-2025-61602

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6965 chars
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III. Intelligence Information for CVE-2025-61602

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

CVE-2025-61601 7.5 HIGH BigBlueButton vulnerable to DoS via PollSubmitVote GraphQL mutation
CVE-2025-55200 7.1 HIGH BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-703

V. Comments for CVE-2025-61602

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