CVE-2025-13314 identifies a missing authorization vulnerability (CWE-862) in the WordPress plugin 'Product Filtering by Categories, Tags, Price Range for WooCommerce – Filter Plus' developed by markutos987. The vulnerability exists because the plugin fails to perform capability checks on two critical AJAX actions: 'filter_save_settings' and 'add_filter_options'. These AJAX endpoints are intended to allow authorized users to save filter settings and add filter options for WooCommerce product listings. However, due to the missing authorization, unauthenticated attackers can invoke these actions remotely without any credentials or user interaction. This allows attackers to arbitrarily modify the plugin’s settings, including creating new filter options that could manipulate how products are displayed or filtered on the e-commerce site. Such unauthorized modifications could be leveraged to disrupt user experience, mislead customers, or facilitate further attacks such as phishing or fraud by altering product visibility or filtering behavior. The vulnerability affects all plugin versions up to and including 1.1.5, and no patches or updates are currently linked, indicating the need for immediate attention from site administrators. The CVSS v3.1 base score is 5.3, reflecting a medium severity with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact is limited to integrity, with no direct confidentiality or availability effects. No known exploits have been reported in the wild as of the publication date, but the ease of exploitation and unauthenticated nature make it a significant risk for WooCommerce sites using this plugin.

For European organizations operating WooCommerce-based e-commerce platforms, this vulnerability poses a risk of unauthorized modification of product filtering settings. This can degrade customer trust and shopping experience by manipulating product visibility, potentially leading to revenue loss or reputational damage. Attackers could use the altered filters to hide certain products, promote others unfairly, or create confusion that facilitates fraudulent transactions or phishing attacks. While the vulnerability does not directly expose sensitive data or cause service outages, the integrity compromise can indirectly affect business operations and customer satisfaction. Given the widespread use of WooCommerce in Europe, especially in countries with mature e-commerce markets, the threat could impact a significant number of online retailers. The lack of authentication requirement and low complexity of exploitation increase the likelihood of opportunistic attacks. Organizations failing to address this vulnerability may face increased risk of targeted or automated attacks aiming to manipulate their online storefronts.

European organizations should immediately audit their WooCommerce installations to identify if the vulnerable 'Product Filtering by Categories, Tags, Price Range for WooCommerce – Filter Plus' plugin is in use, particularly versions up to 1.1.5. In the absence of an official patch, administrators should consider temporarily disabling the plugin or restricting access to the affected AJAX endpoints via web application firewall (WAF) rules or server-level access controls to block unauthenticated requests. Monitoring web server logs for suspicious POST requests to 'filter_save_settings' and 'add_filter_options' AJAX actions can help detect exploitation attempts. Additionally, organizations should implement strict role-based access controls within WordPress to limit plugin management capabilities to trusted administrators only. Regular backups of site configurations and plugin settings are recommended to enable quick restoration if unauthorized changes occur. Finally, maintain vigilance for updates from the plugin vendor or WordPress security advisories to apply official patches promptly once available.