The WP Cost Estimation plugin for WordPress is vulnerable to Upload Directory Traversal in versions before 9.660 via the uploadFormFiles function. This allows attackers to overwrite any file with a whitelisted type on an affected site.
https://www.wordfence.com/blog/2019/02/vulnerabilities-patched-in-wp-cost-estimation-plugin/
https://codecanyon.net/item/wp-cost-estimation-payment-forms-builder/7818230