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Servers and applications · WordPress core

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 \" (backslash double quote) in a crafted Sender property.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 7 Jul 2025.

Severity
Critical 9.8
Published
30 Dec 2016
Last changed
17 Jun 2026
Added to UpHeron
17 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
Joomla!Servers and applications · cpe:a:joomla:joomla\!
  • From 1.5.0 up to 3.6.5
WordPressWordPress core · cpe:a:wordpress:wordpress
  • Every version up to 4.7

Known exploited

CISA name
PHPMailer Command Injection Vulnerability
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.
Due for US agencies
28 Jul 2025
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-10033
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-10033