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    CVE-2026-27737

    BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.

    Published:May 18, 2026
    Last Modified:May 19, 2026
    EPS:May 18, 2026
    EPSS Score:0.00032
    CVSS Score:6.5

    Affected Products

    Vendor
    Bigbluebutton
    Product
    Bbb-playback
    Vendor
    Bigbluebutton
    Product
    Bigbluebutton
    Vendor
    Blindsidenetworks
    Product
    Scalite

    Exploits

    No exploit reference

    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