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    CVE-2025-61602

    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.

    Published:Oct 9, 2025
    Last Modified:Oct 20, 2025
    EPS:Oct 9, 2025
    EPSS Score:0.00049
    CVSS Score:7.5

    Affected Products

    Vendor
    Bigbluebutton
    Product
    Bigbluebutton

    Exploits

    https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcmhttps://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-46355 (CVSS 7.1) — BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/h…
    CVE-2026-46682 (CVSS 8.5) — BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton allowed authenticated modera…
    CVE-2026-46353 (CVSS 8.1) — BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validation could be bypas…
    CVE-2026-46404 (CVSS 6.8) — BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, the presentation URL validation did not pr…
    CVE-2026-46351 (CVSS 8.1) — BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conference sessionToken …
    CVE-2026-27737 (CVSS 6.5) — BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presen…
    CVE-2026-41127 (CVSS 6.5) — BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have a missing authorization that …
    CVE-2026-41126 (CVSS 4.3) — BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have an Open Redirect through bigb…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High