CVE-2025-48279 is a high-severity reflected Cross-site Scripting (XSS) vulnerability identified in the WC MyParcel Belgium plugin developed by Richard Perdaan. This vulnerability affects versions from 4.5.5 through beta releases. The root cause is improper neutralization of user-supplied input during web page generation, categorized under CWE-79. Specifically, the plugin fails to adequately sanitize or encode input parameters before reflecting them in HTTP responses, allowing attackers to inject malicious scripts. When a victim user accesses a crafted URL containing malicious payloads, the injected script executes in the context of the victim's browser session. The CVSS v3.1 score of 7.1 reflects the vulnerability's characteristics: it is remotely exploitable over the network (AV:N), requires no privileges (PR:N), but does require user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the vulnerable component. The impact includes low confidentiality, integrity, and availability impacts individually, but combined they pose a significant risk. Although no known exploits are currently reported in the wild, the vulnerability's nature and ease of exploitation make it a credible threat. The affected product, WC MyParcel Belgium, is a WordPress plugin used primarily for integrating MyParcel shipping services in Belgian e-commerce websites, which may also be used in neighboring European countries. The vulnerability could be leveraged to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious sites, potentially leading to account compromise or data leakage.

For European organizations, especially e-commerce businesses operating in Belgium and surrounding regions, this vulnerability poses a significant risk. Attackers exploiting this reflected XSS can hijack user sessions, leading to unauthorized access to customer accounts or administrative functions. This can result in data breaches involving personal and payment information, damaging customer trust and leading to regulatory penalties under GDPR. Additionally, attackers could use the vulnerability to distribute malware or phishing content, further amplifying the impact. Since WC MyParcel Belgium is a niche plugin focused on shipping integration, organizations relying on it for order fulfillment and logistics may experience operational disruptions if attackers manipulate or disrupt the plugin's functionality. The reflected XSS also risks reputational damage if customers are targeted via the affected websites. Given the plugin's focus on Belgium, organizations in this country are at highest risk, but cross-border e-commerce and logistics companies in neighboring countries could also be affected if they use this plugin or its variants.

Organizations using WC MyParcel Belgium plugin versions 4.5.5 through beta should prioritize updating to a patched version once available. In the absence of an official patch, temporary mitigations include implementing Web Application Firewall (WAF) rules to detect and block common XSS payload patterns targeting the plugin's endpoints. Input validation and output encoding should be enforced at the application level, particularly sanitizing all user-controllable inputs reflected in responses. Administrators should audit their WordPress sites for the presence of this plugin and disable or remove it if not essential. Employing Content Security Policy (CSP) headers can reduce the impact of XSS by restricting script execution sources. Additionally, educating users to avoid clicking suspicious links and monitoring web server logs for unusual request patterns can help detect exploitation attempts early. Regular security assessments and penetration testing focusing on plugin vulnerabilities are recommended to identify and remediate similar issues proactively.