Through the JMail class, there are additional validation which execute this vulnerability impractical within the Joomla environment. Extensions which mass a separate version of PHPMailer or do not use the Joomla API to send email may be vulnerable to this issue.
Joomla users: No action required, the updated library will be included in the next scheduled release and additional mechanisms exist in Joomla core to prevent triggering the vulnerability.
Separate PHPMailer users: upgrade to 5.2.18 or newer as soon as possible.
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