The Gift Cards (Gift Vouchers and Packages) WordPress Plugin, version <= 4.3.1, is affected by an unauthenticated SQL injection vulnerability in the template parameter in the wpgv_doajax_voucher_pdf_save_func action.
View the template here CVE-2023-28662.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2023-28662