CVE Tools
Sign in

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
Self-Check
Nuclei · OpenVAS

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

Packagist
package-ecosystem
phpmailer/phpmailer
OSS Libraries
phpmailer project
oss-project
phpmailerLibrary
OSS Libraries / generic-library
wordpress
oss-project·USaka wordpress mu, wordpress.org, wp
wordpressOn-premWeb App
Web & CMS Plugins / cms-core
joomla
oss-project·AUaka bsq sitestats, joomla!
joomla\!On-premWeb App
Web & CMS Plugins / cms-core
Сообщество свободного программного обеспечения
oss-projectaka fsf
PHPMailerOn-premLibrary
OSS Libraries / generic-library
GNU General Public License
oss-project·USaka gnu gpl, gpl
Joomla!
OSS Libraries
and 1 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
Is your org exposed to CVE-2016-10033?We'll check your whole external perimeter for exposure — free. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

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 →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2016-10033 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows