CVE-2016-10033

CRITICAL9.8

CISA KEV

Published 2016-12-30 · Updated 2026-06-17 · Source cve@mitre.org

Summary

CVE-2016-10033 is a critical-severity (CVSS 9.8) vulnerability in PHP PHPMailer. CISA added it to the Known Exploited Vulnerabilities catalog on July 7, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 28, 2025. CISA does not currently list it as used in ransomware campaigns. PHP has 3 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 3 known-exploited PHP vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-88CWE-88

CISA Known-Exploited Vulnerability

Product: PHP — PHPMailer

Name: PHPMailer Command Injection Vulnerability

Date added: 2025-07-07 · Due: 2025-07-28

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.

References

View on NVD

More exploited PHP vulnerabilities

Most recently added to CISA KEV

CVE-2019-11043
RANSOMWARE
FastCGI Process Manager (FPM) — PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability
added 2022-03-25
CVE-2012-1823
PHP — PHP-CGI Query String Parameter Vulnerability
added 2022-03-25

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