https://www.wordfence.com/threat-intel/vulnerabilities/id/cc49db10-988d-42bd-a9cf-9a86f4c79568?source=cve
https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.9/includes/ajax.php#L88
https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.9/includes/ajax.php#L1518
https://plugins.trac.wordpress.org/browser/backup-backup/tags/1.3.9/includes/ajax.php#L1503
https://www.linuxquestions.org/questions/linux-security-4/php-function-exec-enabled-how-big-issue-4175508082/
https://plugins.trac.wordpress.org/changeset/3012745/backup-backup
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