https://www.wordfence.com/threat-intel/vulnerabilities/id/0646fcba-afe5-49a2-acd5-e15d009926c4?source=cve
https://plugins.trac.wordpress.org/browser/send-pdf-for-contact-form-7/trunk/classes/send-pdf.php#L56
https://plugins.trac.wordpress.org/changeset/3074631/send-pdf-for-contact-form-7/trunk?contextall=1&old=3069882&old_path=%2Fsend-pdf-for-contact-form-7%2Ftrunk
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