CVE-2026-57857 Flow Payment Plugin for WordPress Reflected Cross-Site Scripting via error_message Parameter

The Flow Payment plugin for WordPress flow.cl version 3.0.8 is vulnerable to reflected cross-site scripting on the WooCommerce checkout page. When the plugin handles an order cancellation, the errormessage GET parameter is passed directly to wcaddnotice in flowpayment-fl.php lines 57-58 without...