CVE-2025-3814 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Tax Switch for WooCommerce plugin developed by wijnbergdevelopments for WordPress. This vulnerability exists in all versions up to and including 1.4.2 due to insufficient sanitization and escaping of the ‘class-name’ parameter during web page generation. An attacker with authenticated Contributor-level access or higher can inject arbitrary JavaScript code into pages rendered by the plugin. Because the malicious script is stored persistently, it executes in the context of any user who visits the affected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability does not require user interaction beyond visiting the infected page and does not require higher privileges than Contributor, which is a relatively low-level role in WordPress. The CVSS 3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, and privileges required. The scope is changed, indicating that the vulnerability affects resources beyond the initially vulnerable component. No known exploits have been reported in the wild yet. The issue stems from a failure to properly neutralize input data before outputting it in the HTML context, a classic CWE-79 flaw. The plugin is widely used in WooCommerce stores for tax configuration, making it a relevant target for attackers aiming to compromise e-commerce sites.

The impact of this vulnerability is significant for organizations running WooCommerce stores with the vulnerable Tax Switch plugin. Successful exploitation can lead to session hijacking, theft of sensitive user data, unauthorized actions performed with the victim’s privileges, and potential pivoting to further attacks within the WordPress environment. Since the vulnerability requires only Contributor-level access, attackers who gain low-level authenticated access—via phishing, credential stuffing, or other means—can leverage this flaw to escalate their influence. This can undermine customer trust, lead to data breaches, and cause financial and reputational damage. The stored nature of the XSS means that multiple users can be affected over time, increasing the attack surface. Although no active exploits are known, the medium severity and ease of exploitation warrant prompt attention. The vulnerability does not directly affect server availability but compromises confidentiality and integrity of user sessions and data.

Organizations should immediately monitor for updates from wijnbergdevelopments and apply patches as soon as they are released. Until a patch is available, administrators should restrict Contributor-level access to trusted users only and review existing user roles to minimize exposure. Implementing Web Application Firewall (WAF) rules to detect and block suspicious input patterns targeting the ‘class-name’ parameter can provide temporary protection. Additionally, site administrators can apply manual input validation and output encoding in the plugin’s code if feasible. Regularly auditing user accounts and enforcing strong authentication mechanisms will reduce the risk of unauthorized access. Monitoring logs for unusual activity related to the plugin’s pages can help detect exploitation attempts. Finally, educating users about the risks of phishing and credential compromise will reduce the likelihood of attackers gaining the required access level.