Critical security update: PHPMailer 5.2.20 (CVE-2016-10045)

Published: 2016-12-26
Last Updated: 2016-12-28 19:53:29 UTC
by Russ McRee (Version: 1)
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UPDATE: 28 DEC 2016 - Critical security update for CVE-2016-10045 please update again ASAP. This is in addition to CVE-2016-10033 as fixed in 5.2.18. You should update to 5.2.20 at a minimum.

Vulnerability: PHPMailer < 5.2.20 Remote Code Execution [CVE-2016-10033]

Severity: CRITICAL

ISC recommended action: This is a very popular application, left unpatched it will be exploited.

Finder: Dawid Golunski (@dawid_golunski),

"Probably the world's most popular code for sending email from PHP!
Used by many open-source projects: WordPress, Drupal, 1CRM, SugarCRM, Yii, Joomla! and many more"

An independent research uncovered a critical vulnerability in PHPMailer that could potentially be used by (unauthenticated) remote attackers to achieve remote arbitrary code execution in the context of the web server user and remotely compromise the target web application.
To exploit the vulnerability an attacker could target common website components such as contact/feedback forms, registration forms, password email resets and others that send out emails with the help of a vulnerable version of the PHPMailer class.

The PHPMailer team has released update 5.2.18 to address this critical security finding.


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Russ McRee | @holisticinfosec

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