CVE-2026-57857
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
The Flow Payment plugin for WordPress version 3.0.8 is vulnerable to reflected XSS on the WooCommerce checkout page. The error_message parameter is passed unsanitized to wc_add_notice(), allowing an unauthenticated attacker to execute JavaScript in the victim's browser.
Risk Assessment
An attacker can hijack user sessions, steal credit card data, or redirect to a malicious site, posing a serious threat to store customers.
Recommendation
Update the Flow Payment plugin to the latest version. Temporarily disable the plugin or add custom validation for the error_message parameter.
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Original NVD description (English source)
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 error_message GET parameter is passed directly to wc_add_notice() in flowpayment-fl.php (lines 57-58) without input sanitization (for example sanitize_text_field()) or output escaping (for example esc_html()) before being rendered in the checkout notice HTML. An unauthenticated attacker can craft a URL containing a JavaScript payload in the error_message parameter (for example /checkout/?add-to-cart={product-id}&cancel_order=true&error_message={payload}); when a victim with an active WooCommerce checkout session follows the link, the payload executes in the victim's browser in the origin of the WordPress site.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS