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    CVE-2016-10033

    The mailSend function in the isMail transport in PHPMailer before 5.2.18 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted Sender property.

    Published:Dec 30, 2016
    Last Modified:Apr 21, 2026
    EPS:Dec 30, 2016
    EPSS Score:0.94465
    CVSS Score:9.8

    CISA Notification

    Description

    The mailSend function in the isMail transport in PHPMailer before 5.2.18 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted Sender property.

    Required Action:

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    Jul 28, 2025
    410 days ago
    Alert Date
    Jul 7, 2025
    431 days ago

    Affected Products

    Vendor
    Joomla
    Product
    Joomla\!
    Vendor
    Phpmailer Project
    Product
    Phpmailer
    Vendor
    Wordpress
    Product
    Wordpress

    Exploits

    http://packetstormsecurity.com/files/140291/PHPMailer-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/140350/PHPMailer-Sendmail-Argument-Injection.htmlhttp://www.rapid7.com/db/modules/exploit/multi/http/phpmailer_arg_injectionhttp://www.securityfocus.com/bid/95108https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.htmlhttps://www.exploit-db.com/exploits/40968/https://www.exploit-db.com/exploits/40969/https://www.exploit-db.com/exploits/40970/https://www.exploit-db.com/exploits/40974/https://www.exploit-db.com/exploits/40986/https://www.exploit-db.com/exploits/41962/https://www.exploit-db.com/exploits/41996/https://www.exploit-db.com/exploits/42024/https://www.exploit-db.com/exploits/42221/http://packetstormsecurity.com/files/140291/PHPMailer-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/140350/PHPMailer-Sendmail-Argument-Injection.htmlhttp://www.rapid7.com/db/modules/exploit/multi/http/phpmailer_arg_injectionhttp://www.securityfocus.com/bid/95108https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.htmlhttps://www.exploit-db.com/exploits/40968/https://www.exploit-db.com/exploits/40969/https://www.exploit-db.com/exploits/40970/https://www.exploit-db.com/exploits/40974/https://www.exploit-db.com/exploits/40986/https://www.exploit-db.com/exploits/41962/https://www.exploit-db.com/exploits/41996/https://www.exploit-db.com/exploits/42024/https://www.exploit-db.com/exploits/42221/https://www.exploit-db.com/exploits/41962https://github.com/0x00-0x00/CVE-2016-10033https://github.com/alexander47777/CVE-2016-10033https://github.com/Astrowmist/POC-CVE-2016-10033https://github.com/awidardi/opsxcq-cve-2016-10033https://github.com/Bajunan/CVE-2016-10033https://github.com/blue-chocolates/CVE-2016-10033https://github.com/CAOlvchonger/CVE-2016-10033https://github.com/chipironcin/CVE-2016-10033https://github.com/cved-sources/cve-2016-10033https://github.com/ElnurBDa/CVE-2016-10033https://github.com/GeneralTesler/CVE-2016-10033https://github.com/j4k0m/CVE-2016-10033https://github.com/liusec/WP-CVE-2016-10033https://github.com/opsxcq/exploit-CVE-2016-10033https://github.com/pedro823/cve-2016-10033-45https://github.com/qwertyuiop12138/CVE-2016-10033https://github.com/sealldeveloper/CVE-2016-10033-PoChttps://github.com/zeeshanbhattined/exploit-CVE-2016-10033https://github.com/Zenexer/safeshellhttps://www.exploit-db.com/exploits/40968https://www.exploit-db.com/exploits/40969https://www.exploit-db.com/exploits/40970https://www.exploit-db.com/exploits/40974https://www.exploit-db.com/exploits/40986https://www.exploit-db.com/exploits/41996https://www.exploit-db.com/exploits/42024https://www.exploit-db.com/exploits/42221

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    References

    http://packetstormsecurity.com/files/140291/PHPMailer-Remote-Code-Execution.html
    http://packetstormsecurity.com/files/140350/PHPMailer-Sendmail-Argument-Injection.html
    http://seclists.org/fulldisclosure/2016/Dec/78
    http://www.rapid7.com/db/modules/exploit/multi/http/phpmailer_arg_injection
    http://www.securityfocus.com/archive/1/539963/100/0/threaded
    http://www.securityfocus.com/bid/95108
    http://www.securitytracker.com/id/1037533
    https://developer.joomla.org/security-centre/668-20161205-phpmailer-security-advisory.html
    https://github.com/PHPMailer/PHPMailer/releases/tag/v5.2.18
    https://github.com/PHPMailer/PHPMailer/wiki/About-the-CVE-2016-10033-and-CVE-2016-10045-vulnerabilities
    https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.html
    https://www.drupal.org/psa-2016-004
    https://www.exploit-db.com/exploits/40968/
    https://www.exploit-db.com/exploits/40969/
    https://www.exploit-db.com/exploits/40970/
    https://www.exploit-db.com/exploits/40974/
    https://www.exploit-db.com/exploits/40986/
    https://www.exploit-db.com/exploits/41962/
    https://www.exploit-db.com/exploits/41996/
    https://www.exploit-db.com/exploits/42024/
    https://www.exploit-db.com/exploits/42221/
    http://packetstormsecurity.com/files/140291/PHPMailer-Remote-Code-Execution.html
    http://packetstormsecurity.com/files/140350/PHPMailer-Sendmail-Argument-Injection.html
    http://seclists.org/fulldisclosure/2016/Dec/78
    http://www.rapid7.com/db/modules/exploit/multi/http/phpmailer_arg_injection
    http://www.securityfocus.com/archive/1/539963/100/0/threaded
    http://www.securityfocus.com/bid/95108
    http://www.securitytracker.com/id/1037533
    https://developer.joomla.org/security-centre/668-20161205-phpmailer-security-advisory.html
    https://github.com/PHPMailer/PHPMailer/releases/tag/v5.2.18
    https://github.com/PHPMailer/PHPMailer/wiki/About-the-CVE-2016-10033-and-CVE-2016-10045-vulnerabilities
    https://legalhackers.com/advisories/PHPMailer-Exploit-Remote-Code-Exec-CVE-2016-10033-Vuln.html
    https://www.drupal.org/psa-2016-004
    https://www.exploit-db.com/exploits/40968/
    https://www.exploit-db.com/exploits/40969/
    https://www.exploit-db.com/exploits/40970/
    https://www.exploit-db.com/exploits/40974/
    https://www.exploit-db.com/exploits/40986/
    https://www.exploit-db.com/exploits/41962/
    https://www.exploit-db.com/exploits/41996/
    https://www.exploit-db.com/exploits/42024/
    https://www.exploit-db.com/exploits/42221/
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-10033

    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