CVE-2025-61602
BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
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.
INFO
Published Date :
Oct. 9, 2025, 9:15 p.m.
Last Modified :
Oct. 20, 2025, 3:36 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source | 
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | 
Solution
- Update BigBlueButton to version 3.0.13 or later.
- Apply the vendor-supplied patch.
References to Advisories, Solutions, and Tools
                                            Here, you will find a curated list of external links that provide in-depth
                                            information, practical solutions, and valuable tools related to
                                            CVE-2025-61602.
                                        
| URL | Resource | 
|---|---|
| https://github.com/bigbluebutton/bigbluebutton/pull/23651 | Issue Tracking Patch | 
| https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm | Exploit Vendor Advisory | 
| https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm | Exploit Vendor Advisory | 
CWE - Common Weakness Enumeration
            While CVE identifies
            specific instances of vulnerabilities, CWE categorizes the common flaws or
            weaknesses that can lead to vulnerabilities. CVE-2025-61602 is
            associated with the following CWEs:
        
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
            (CAPEC)
            stores attack patterns, which are descriptions of the common attributes and
            approaches employed by adversaries to exploit the CVE-2025-61602
            weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
			The following list is the news that have been mention
			CVE-2025-61602 vulnerability anywhere in the article.
		
                The following table lists the changes that have been made to the
                CVE-2025-61602 vulnerability over time.
            
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
- 
                            Initial Analysis by [email protected]Oct. 20, 2025 Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.13 Added Reference Type GitHub, Inc.: https://github.com/bigbluebutton/bigbluebutton/pull/23651 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Types: Exploit, Vendor Advisory 
- 
                            CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0Oct. 10, 2025 Action Type Old Value New Value Added Reference https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm 
- 
                            New CVE Received by [email protected]Oct. 09, 2025 Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-703 Added Reference https://github.com/bigbluebutton/bigbluebutton/pull/23651 Added Reference https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm 
 
                         
                         
                         
                                             
                                            