Your version of PHP is too low. While you should most certainly upgrade your Zen Cart, the version of PHP is too low as Zen Cart v1.5.7 is designed for PHP 5.6 through PHP 8.0 (with PHP 7.4 recommended). (https://docs.zen-cart.com/user/first..._requirements/)
I would watch for the number of gift certificates sent, or any other GV related strange activity because you may be vulnerable.
Do not post a link to your site in this thread for security.
I would proceed to update your PHP to 7.4 on your installation and make plans to begin upgrading to 1.5.8a ASAP.
~Melanie
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