CVE-2025-59565 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the WP Swings Upsell Order Bump Offer plugin for WooCommerce. This vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and store arbitrary scripts within the plugin’s data handling processes. When a victim user accesses the affected page, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability affects versions up to 3.0.7 of the plugin. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) shows that the attack can be executed remotely over the network with low attack complexity, requires low privileges, and user interaction is needed. The scope is changed, meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes low confidentiality, integrity, and availability impacts, but the stored nature of the XSS increases risk as the payload persists and can affect multiple users. No known exploits are currently in the wild, and no patches have been linked yet. This vulnerability is significant because WooCommerce is a widely used e-commerce platform, and the Upsell Order Bump Offer plugin is used to increase sales by offering additional products during checkout. Exploiting this vulnerability could allow attackers to compromise customer data or manipulate transactions, undermining trust and causing financial and reputational damage.

For European organizations, especially e-commerce businesses using WooCommerce with the WP Swings Upsell Order Bump Offer plugin, this vulnerability poses a tangible risk. Attackers could leverage stored XSS to hijack user sessions, steal sensitive customer information such as payment details or personal data, or perform fraudulent transactions. This can lead to violations of GDPR due to unauthorized data exposure, resulting in regulatory penalties and loss of customer trust. The persistence of the malicious script means multiple users could be affected over time, amplifying the impact. Additionally, attackers might use the vulnerability as a foothold to escalate privileges or pivot within the affected organization’s network. Given the widespread adoption of WooCommerce in Europe’s SMB and enterprise sectors, the threat could disrupt business operations, damage brand reputation, and incur financial losses due to fraud remediation and legal consequences.

Organizations should immediately audit their WooCommerce installations to identify the presence of the WP Swings Upsell Order Bump Offer plugin and its version. Until an official patch is released, administrators should consider disabling or removing the plugin to eliminate exposure. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the plugin’s endpoints can provide interim protection. Input validation and output encoding should be enforced at the application level to prevent malicious scripts from being stored or rendered. Regular security scanning and penetration testing focused on e-commerce workflows can help detect exploitation attempts. Monitoring logs for unusual user input or error patterns related to the plugin is recommended. Once a patch is available, prompt application of updates is critical. Additionally, educating staff and users about phishing and suspicious links can reduce the risk of successful exploitation requiring user interaction.