Keep your WordPress core updated, and never allow write permissions (777) on the wp-includes folder. If your logs show this string, treat it as an active security incident until you prove otherwise. Stay safe out there.
At first glance, it looks like a normal core file path. But in the world of WordPress security, this combination is often a . -KEYWORD-wp-includes PHPMailer index.php
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Hackers constantly scan for old WordPress sites trying to inject malicious code through the mailer system. Why index.php ? Hackers don’t usually target the root index.php . They target nested paths , like: /wp-includes/PHPMailer/index.php or /wp-includes/PHPMailer/class.phpmailer.php Keep your WordPress core updated, and never allow