CVE-2025-61602BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-703
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 10, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
bigbluebutton bigbluebutton bigbluebutton:bigbluebutton (from the name) | before 3.0.13 | CNA record |
bigbluebutton bigbluebutton bigbluebutton:bigbluebutton | before 3.0.13 | NVD |
References
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcmx-refsource-confirm, exploit, vendor-advisory
- https://github.com/bigbluebutton/bigbluebutton/pull/23651x-refsource-misc, issue-tracking, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.