CVE-2025-61602Public exploitNetwork attack vector

Chat crash via unvalidated reaction identifier

Published Oct 9, 2025 · Updated Oct 9, 2025

Denial of service in BigBlueButton before 3.0.13 allows remote authenticated users to crash meeting chat via a crafted reaction. The chatSendMessageReaction GraphQL mutation accepts an unvalidated reactionEmojiId, after which clients dereference the missing emoji object's skins property. Any meeting participant can trigger the frontend error, preventing all participants from reading or sending chat messages in that meeting.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in BigBlueButton before 3.0.13 allows remote authenticated users to crash meeting chat via a crafted reaction. The chatSendMessageReaction GraphQL mutation accepts an unvalidated reactionEmojiId, after which clients dereference the missing emoji object's skins property. Any meeting participant can trigger the frontend error, preventing all participants from reading or sending chat messages in that meeting.

The record

CVE
CVE-2025-61602
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
BigBlueButton Inc.
Product
BigBlueButton
Classifications
CWE-703, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BigBlueButton Inc. · BigBlueButtonversion=< 3.0.13

Published CVSS scores

7.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-703Improper Check or Handling of Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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