Description: s.masugata has reported a vulnerability in PHP, which potentially can be exploited by malicious people to use it as an open mail relay.
The vulnerability is caused due to an input validation error in the "mb_send_mail()" function. This can be exploited to inject arbitrary headers in a mail sent via a script calling the "mb_send_mail()" function where the "To" parameter can be controlled by the attacker.
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