WordPress Sliced Invoices 3.8.2 contains an authenticated SQL injection vulnerability that allows authenticated attackers to manipulate database queries by injecting SQL code through the 'post' parameter. Attackers can send requests to the admin.php endpoint with action=duplicate_quote_invoice and malicious 'post' values to extract sensitive database information or modify data.
https://www.vulncheck.com/advisories/wordpress-sliced-invoices-sql-injection-via-post-parameter
https://www.exploit-db.com/exploits/47540