CVE-2025-49947 identifies a reflected Cross-site Scripting (XSS) vulnerability in the extendons WooCommerce Registration Fields Plugin - Custom Signup Fields, specifically versions up to 3.2.3. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is reflected back to users. This reflected XSS can be exploited by crafting a malicious URL or form input that, when visited or submitted by a victim, executes attacker-controlled scripts within the victim’s browser context. The vulnerability does not require any authentication (AV:N) and has low attack complexity (AC:L), but it does require user interaction (UI:R), such as clicking a malicious link. The scope is changed (S:C), indicating that the vulnerability can affect resources beyond the vulnerable component, potentially impacting the entire web application session. The impact includes partial loss of confidentiality (C:L), integrity (I:L), and availability (A:L), as attackers can steal session cookies, manipulate page content, or cause denial of service through script execution. Although no known exploits are currently reported in the wild, the high CVSS score (7.1) reflects the significant risk posed by this vulnerability. The plugin is widely used in WooCommerce-based e-commerce websites to customize registration fields, making it a valuable target for attackers seeking to compromise user accounts or inject malicious content. The vulnerability was reserved in June 2025 and published in October 2025, with no patch links currently available, indicating that remediation is pending or in progress.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the affected plugin, this vulnerability poses a significant risk. Successful exploitation can lead to session hijacking, enabling attackers to impersonate legitimate users, including customers or administrators, potentially leading to unauthorized transactions or data theft. The reflected XSS can also be used to deliver phishing attacks or malware, damaging brand reputation and customer trust. The partial loss of integrity and availability can disrupt business operations, cause financial losses, and trigger regulatory scrutiny under GDPR due to compromised personal data. Given the plugin’s role in user registration, attackers could manipulate signup processes or harvest sensitive user information. The lack of authentication requirement lowers the barrier for attackers, increasing the likelihood of exploitation. Organizations with high web traffic and customer engagement are particularly vulnerable, and the attack surface includes all users interacting with registration forms. The absence of known exploits in the wild provides a window for proactive mitigation, but the high severity demands urgent attention to prevent potential attacks.

1. Monitor the vendor’s communications and apply official patches immediately once released to address CVE-2025-49947. 2. In the interim, implement strict input validation and output encoding on all user-supplied data in registration fields to neutralize malicious scripts. 3. Deploy or update Web Application Firewalls (WAFs) with rules specifically targeting reflected XSS payloads to block malicious requests before they reach the application. 4. Educate users and administrators about the risks of clicking suspicious links, especially those related to registration or login pages. 5. Conduct regular security assessments and penetration testing focusing on input handling in WooCommerce plugins. 6. Consider temporarily disabling or replacing the affected plugin with alternative solutions that have been verified as secure. 7. Enable Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 8. Review and harden session management practices to minimize the impact of session hijacking attempts. 9. Maintain comprehensive logging and monitoring to detect anomalous activities indicative of exploitation attempts. 10. Coordinate with legal and compliance teams to ensure GDPR and other regulatory requirements are met in case of data breaches.