CVE-2025-62903 identifies a stored cross-site scripting (XSS) vulnerability in the WPClever WPC Smart Messages plugin for WooCommerce, specifically affecting versions up to 4.2.4. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows an attacker with at least limited privileges (PR:L) to inject malicious scripts that are stored and later executed in the browsers of other users viewing the affected pages. The CVSS v3.1 base score is 5.4, reflecting a medium severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially compromised component. The impact affects confidentiality and integrity (C:L/I:L) but not availability (A:N). Although no known exploits are currently reported in the wild, the stored XSS nature means that once exploited, attackers can steal session cookies, perform actions on behalf of users, or manipulate displayed content, potentially leading to account compromise or misinformation. The vulnerability is particularly relevant in e-commerce environments where WPC Smart Messages is used to display dynamic messages to customers, making it a vector for targeted attacks against customers or administrators. The lack of an official patch link suggests that remediation may require vendor updates or temporary mitigations such as input sanitization or disabling the plugin.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the WPC Smart Messages plugin, this vulnerability poses a moderate risk. Successful exploitation can lead to theft of user credentials or session tokens, unauthorized actions performed on behalf of users, and manipulation of displayed messages that could mislead customers or damage brand reputation. Confidentiality and integrity of user data are at risk, which can result in regulatory compliance issues under GDPR if personal data is compromised. The attack requires some privilege and user interaction, limiting mass exploitation but making targeted attacks against administrators or logged-in users feasible. Given the widespread use of WooCommerce in Europe, particularly in countries with large e-commerce markets, the impact could be significant if left unmitigated. Additionally, attackers could leverage this vulnerability to conduct phishing or social engineering campaigns by injecting malicious content into trusted web pages.

European organizations should immediately assess their use of the WPC Smart Messages plugin and verify the version in use. Since no official patch link is currently available, organizations should monitor vendor communications for updates and apply patches promptly once released. In the interim, implement strict input validation and output encoding on all user-supplied data displayed by the plugin to prevent script injection. Consider disabling or removing the plugin if it is not essential to operations. Employ web application firewalls (WAFs) with rules to detect and block common XSS payloads targeting this plugin. Conduct regular security audits and penetration testing focusing on user input handling in WooCommerce plugins. Educate administrators and users about the risks of clicking on suspicious links or interacting with unexpected messages. Finally, monitor logs and user reports for signs of exploitation or unusual behavior related to message content.