CVE-2016-10033: PHPMailer Command Injection Vulnerability

Required action (CISA's text)

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

Description (NVD)

PHPMailer contains a command injection vulnerability because it fails to sanitize user-supplied input. Specifically, this issue affects the 'mail()' function of 'class.phpmailer.php' script. An attacker can exploit this issue to execute arbitrary code within the context of the application. Failed exploit attempts will result in a denial-of-service condition.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other PHP flaws

• CVE-2019-11043: PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability
• CVE-2012-1823: PHP-CGI Query String Parameter Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.