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    CVE-2023-53979

    MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.

    Published:Dec 22, 2025
    Last Modified:Mar 5, 2026
    EPS:Dec 22, 2025
    EPSS Score:0.00111
    CVSS Score:8.8

    Affected Products

    Vendor
    Mybb
    Product
    Mybb

    Exploits

    https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/https://www.exploit-db.com/exploits/51213https://www.vulncheck.com/advisories/mybb-authenticated-remote-code-execution-via-chained-vulnerabilities

    Related CVEs

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    CVE-2026-45124 (CVSS 4.3) — MyBB is free and open source forum software. Prior to 1.8.40, the Mod CP Report Center does not check permissi…
    CVE-2026-45120 (CVSS 5.4) — MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not verify private even…
    CVE-2026-47245 (CVSS 4.3) — MyBB is free and open source forum software. Prior to 1.8.40, the User CP Buddy/Ignore List component does not…
    CVE-2026-45734 (CVSS 5.3) — MyBB is free and open source forum software. Prior to 1.8.40, the built-in CAPTCHA does not consistently enfor…
    CVE-2026-45125 (CVSS 5.3) — MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize send…
    CVE-2026-45122 (CVSS 4.3) — MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not validate moderation…
    CVE-2026-45119 (CVSS 4.6) — MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP UTF-8 Conversion module does not va…

    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