CVE-2025-61602CWE-703

CVE-2025-61602

High · published October 10, 2025

CVSS v3.1

7.5

EPSS

Percentile

32.2

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 7.5 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0: Not supplied
EPSS: 0.00393 · 32.2th percentile
Weakness: CWE-703 · Improper Check or Handling of Exceptional Conditions
Published: 2025-10-10T01:15Z

Affected products (1)

Product	Versions	Fixed in
bigbluebutton/bigbluebutton	< 3.0.13	3.0.13

References (3)

https://github.com/bigbluebutton/bigbluebutton/pull/23651 · [email protected]https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm · [email protected]https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm · 134c704f-9b21-4f2e-91b3-4a467353bcc0

EPSS history

Timeline

09 OCT 20:40Z
BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
cvelistv5