CVE-2025-67542 identifies a DOM-based Cross-site Scripting (XSS) vulnerability in the SilkyPress Multi-Step Checkout plugin for WooCommerce, versions up to and including 2.33. The vulnerability stems from improper neutralization of user-supplied input during web page generation, specifically within the multi-step checkout process. DOM-based XSS occurs when client-side scripts write untrusted data to the Document Object Model (DOM) without proper sanitization or encoding, enabling attackers to execute arbitrary JavaScript in the context of the victim's browser. This can lead to session hijacking, credential theft, or unauthorized actions on behalf of the user. The plugin is widely used in WooCommerce environments to streamline the checkout process, making this vulnerability particularly concerning for e-commerce sites. No CVSS score has been assigned yet, and no known exploits have been reported in the wild, but the vulnerability is publicly disclosed and should be treated as a serious risk. The lack of patches at the time of disclosure necessitates immediate attention to input validation and output encoding practices. The vulnerability does not require authentication, increasing its risk profile. Attackers could exploit this by tricking users into clicking crafted links or visiting malicious sites that interact with vulnerable checkout pages. The issue affects the confidentiality and integrity of user data and the availability of the e-commerce service if exploited to disrupt transactions or inject malicious content.

For European organizations, the impact of CVE-2025-67542 could be significant, especially for those operating e-commerce platforms using WooCommerce with the SilkyPress Multi-Step Checkout plugin. Exploitation could lead to theft of sensitive customer information such as payment details and personal data, damaging customer trust and potentially violating GDPR regulations. The integrity of transaction data could be compromised, leading to fraudulent orders or financial losses. Additionally, successful exploitation could facilitate further attacks such as phishing or malware distribution by injecting malicious scripts into trusted web pages. This could result in reputational damage and legal liabilities. The vulnerability's ease of exploitation without authentication and lack of user interaction requirements increase the risk of widespread attacks. Disruption of the checkout process could also impact business availability and revenue streams. European organizations must consider these factors seriously, as e-commerce is a critical sector with stringent data protection requirements.

1. Monitor SilkyPress and WooCommerce vendor channels closely for official patches addressing CVE-2025-67542 and apply them immediately upon release. 2. Until patches are available, implement strict input validation on all user-supplied data entering the multi-step checkout process, ensuring that only expected and safe characters are accepted. 3. Apply proper output encoding and sanitization on all dynamic content rendered in the DOM to prevent script injection. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 5. Conduct regular security audits and penetration testing focused on client-side scripting and checkout workflows. 6. Educate web developers and administrators about secure coding practices related to DOM manipulation and XSS prevention. 7. Monitor web server and application logs for unusual activity or signs of exploitation attempts, such as suspicious query parameters or script injections. 8. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting WooCommerce checkout pages. 9. Encourage customers to use updated browsers with built-in XSS protections and enable multi-factor authentication where possible to reduce account takeover risks.