CVE-2025-61602
Last modified
CVE-2025-61602 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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`. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Bigbluebutton | Bigbluebutton | < 3.0.13 |
References
- https://github.com/bigbluebutton/bigbluebutton/pull/23651Issue Tracking, Patch
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcmExploit, Vendor Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcmExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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