CVE-2025-58917 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the WordPress plugin 'Quantities and Units for WooCommerce' developed by Nick Verwymeren. This plugin is used to enhance WooCommerce stores by allowing customers to specify quantities and units for products. The vulnerability arises due to improper neutralization of input during web page generation, meaning that user-supplied data is not correctly sanitized or escaped before being rendered in the web interface. As a result, an attacker with at least low-level privileges (PR:L) and requiring user interaction (UI:R) can inject malicious scripts that are stored persistently within the plugin's data. When other users or administrators view the affected pages, the malicious script executes in their browsers, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the WooCommerce environment. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector (AV:N), low attack complexity (AC:L), partial privileges required (PR:L), user interaction needed (UI:R), and a scope change (S:C) indicating that the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability at a low level (C:L/I:L/A:L). No known exploits are currently reported in the wild, and no patches have been published yet. The affected versions include all versions up to 1.0.13, with no specific version range provided. This vulnerability is significant because WooCommerce is widely used in e-commerce platforms, and plugins that extend its functionality are common attack vectors for web-based attacks such as XSS. Stored XSS is particularly dangerous as it can affect multiple users and administrators, potentially compromising the entire e-commerce site and customer data.

For European organizations operating WooCommerce-based e-commerce sites using the 'Quantities and Units for WooCommerce' plugin, this vulnerability poses a tangible risk. Exploitation could lead to unauthorized script execution in the context of the website, enabling attackers to steal session cookies, perform actions on behalf of legitimate users, or inject further malicious payloads. This can result in data breaches involving customer information, financial fraud, defacement of the website, or disruption of e-commerce operations. Given the importance of e-commerce in Europe and the strict data protection regulations such as GDPR, any compromise leading to data leakage or service disruption could have severe legal and reputational consequences. Additionally, the scope change in this vulnerability suggests that the impact could extend beyond the plugin itself, potentially affecting other components or user roles within the WooCommerce environment. The requirement for user interaction and partial privileges means that attackers may need to compromise or trick a user with some level of access, such as a shop manager or content editor, which is plausible in many organizational contexts. Overall, the vulnerability could undermine customer trust and lead to financial losses and regulatory penalties if exploited.

1. Immediate mitigation should include disabling or uninstalling the 'Quantities and Units for WooCommerce' plugin until a security patch is released. 2. Monitor official channels from the plugin developer and Patchstack for updates or patches addressing CVE-2025-58917. 3. Implement Web Application Firewall (WAF) rules that detect and block common XSS payloads targeting WooCommerce plugins. 4. Enforce strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on e-commerce pages. 5. Conduct a thorough audit of user roles and permissions in WordPress to minimize the number of users with privileges that could be leveraged to exploit this vulnerability. 6. Educate users with elevated privileges about phishing and social engineering risks to reduce the chance of user interaction exploitation. 7. Regularly review and sanitize all user-generated content and inputs in WooCommerce and related plugins, applying custom filters if necessary. 8. Consider deploying security plugins that provide enhanced input validation and output encoding for WordPress environments. 9. After patching, perform penetration testing focusing on XSS vectors to verify the vulnerability is fully remediated.