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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 \" (...

Published: Dec 30, 2016Updated: Apr 21, 2026 Sources: CVE List NVD GHSA BDUCWE-88
9.8CRITICAL
NVD MITRE
EPSS Score
99.7%
Top 0.0%
CISA KEV
Active Exploitation
Since Jul 7, 2025
Exploits
24 Known
Remediation
Patch Available

Description

Remote code execution in PHPMailer

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-88

Affected Products

phpmailer/phpmailerPackagistOSS Libraries
phpmailerphpmailer project
Library
OSS Libraries / generic-library
wordpresswordpress
On-premWeb App
Web & CMS Plugins / cms-core
joomla\!joomla
On-premWeb App
Web & CMS Plugins / cms-core
PHPMailerСообщество свободного программного обеспечения
On-premLibrary
OSS Libraries / generic-library
packagistpackage-ecosystemOSS Libraries
phpmailer projectoss-projectOSS Libraries
wordpressoss-projectUSWeb & CMS Pluginsaka wp, wordpress.org, wordpress mu
joomlaoss-projectAUWeb & CMS Pluginsaka joomla!, bsq sitestats
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 2 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jul 7, 2025
Remediation due:Jul 28, 2025

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.

24 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify Rather we check it for you?We'll check your whole external perimeter for exposure — free. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-5f37-gxvh-23v6
github.com
https://nvd.nist.gov/vuln/detail/CVE-2016-10033
nvd.nist.gov
https://www.exploit-db.com/exploits/42221
exploit-db.com
and 37 more references View all →

Timeline

Published
Dec 30, 2016
Added to CISA KEV
Jul 7, 2025
Last Updated
Apr 21, 2026

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