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    CVE-2023-53978

    myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.

    Published:Dec 22, 2025
    Last Modified:Apr 7, 2026
    EPS:Dec 22, 2025
    EPSS Score:0.00039
    CVSS Score:5.4

    Affected Products

    Vendor
    Mybb
    Product
    Mybb

    Exploits

    https://www.exploit-db.com/exploits/51136https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements

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    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