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CVE-2016-10033: PHPMailer Command Injection Vulnerability

criticalknown exploitedpublic exploitCVE-2016-10033
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: PHPMailerproduct: PHPMailerCode injectionDenial of service
What
PHPMailer contains a command injection vulnerability that allows execution of arbitrary code within the context of the application.
Who is affected
Users of PHPMailer that utilize the 'mail()' function in 'class.phpmailer.php' are affected.
Urgency
This vulnerability is critical and has been exploited, making remediation urgent.
Action
Upgrade to the latest version of PHPMailer to fix this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-07-07
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2016-10033

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2016-10033coverage & exploitation statusNVD · CVE.org

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