CVE-2025-49434 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Laposta WooCommerce plugin developed by stijnvanderree. This vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing malicious scripts to be injected and stored within the application. When a victim accesses the affected page, the malicious script executes in their browser context. The affected versions include all versions up to and including 1.9.1. The vulnerability has a CVSS 3.1 base score of 5.9, indicating a medium severity level. The CVSS vector (AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L) reveals that the attack can be executed remotely over the network with low attack complexity but requires high privileges and user interaction. The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact includes limited confidentiality, integrity, and availability loss. Stored XSS in an e-commerce context like WooCommerce can lead to session hijacking, defacement, redirection to malicious sites, or theft of sensitive customer data. Since no patches or known exploits are currently reported, the risk is theoretical but should be addressed promptly. The vulnerability is particularly concerning because WooCommerce is widely used for online retail, and Laposta WooCommerce integrates email marketing with WooCommerce, potentially exposing customer data and business operations to compromise.

For European organizations using Laposta WooCommerce, this vulnerability could lead to unauthorized script execution in the browsers of administrators or customers with elevated privileges, resulting in theft of session cookies, manipulation of order data, or injection of fraudulent content. This can damage brand reputation, cause financial losses, and violate GDPR requirements regarding data protection and breach notification. The requirement for high privileges limits exploitation to users with elevated access, such as administrators or trusted staff, but the stored nature of the XSS means that once injected, any user visiting the affected page could be impacted. This risk is heightened in European markets where e-commerce is heavily regulated and customer trust is critical. Additionally, the scope change in the vulnerability means that the impact could extend beyond the plugin itself, potentially affecting other integrated systems or data flows. Organizations may face legal and compliance repercussions if customer data confidentiality or integrity is compromised.

European organizations should immediately audit their use of Laposta WooCommerce and restrict administrative access to trusted personnel only. Implement strict input validation and output encoding on all user-supplied data within the plugin, especially in areas that generate web pages or emails. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. Monitor logs for unusual activity indicative of attempted XSS exploitation. Since no official patch is currently available, consider temporarily disabling the Laposta WooCommerce plugin or isolating it in a sandboxed environment until a fix is released. Engage with the vendor or community to track patch availability and apply updates promptly. Additionally, conduct regular security awareness training for administrators to recognize phishing or social engineering attempts that could facilitate exploitation. Finally, implement web application firewalls (WAF) with rules designed to detect and block XSS payloads targeting the plugin's endpoints.