CVE-2025-63879 identifies a reflected cross-site scripting (XSS) vulnerability in the /ecommerce/products.php component of the E-commerce Project version 1.0 and earlier. The vulnerability arises because the id parameter in the URL is not properly sanitized or encoded before being reflected in the HTTP response. An attacker can craft a malicious URL containing JavaScript payloads within the id parameter. When a user clicks this URL, the injected script executes in the user's browser under the domain of the vulnerable e-commerce site. This can lead to various malicious outcomes, including stealing session cookies, performing actions on behalf of the user, or redirecting users to phishing sites. The vulnerability does not require authentication, making it accessible to unauthenticated attackers. However, exploitation depends on social engineering to lure victims into clicking the malicious link. No CVSS score has been assigned yet, and no patches or known exploits have been reported. The vulnerability is typical of reflected XSS flaws, which are common in web applications that fail to properly validate or encode user-supplied input before reflecting it back in responses. Given the widespread use of e-commerce platforms in Europe, this vulnerability poses a risk to organizations relying on this software for online sales and customer interactions.

For European organizations, this vulnerability can compromise the confidentiality and integrity of user sessions and data. Attackers exploiting this flaw can hijack user sessions, steal sensitive information such as login credentials or payment details, and perform unauthorized transactions or actions on the victim's behalf. This can lead to financial losses, reputational damage, and regulatory penalties under GDPR if customer data is compromised. The reflected XSS nature means the attack requires user interaction, but phishing campaigns can be effective vectors. E-commerce businesses in Europe are particularly at risk due to the high volume of online transactions and customer trust expectations. The lack of patches increases exposure time, and the vulnerability could be leveraged as part of broader attack chains, including malware delivery or lateral movement within compromised networks.

Organizations should implement strict input validation and output encoding on the id parameter to neutralize malicious scripts. Employing context-aware encoding (e.g., HTML entity encoding) before reflecting user input in responses is critical. Web application firewalls (WAFs) can provide an additional layer of defense by detecting and blocking suspicious payloads targeting this parameter. Security teams should conduct thorough code reviews and penetration testing focused on XSS vulnerabilities. User education to recognize suspicious links can reduce successful exploitation. Monitoring web traffic for anomalous requests targeting the products.php endpoint can help detect exploitation attempts. Once patches become available, timely application is essential. Additionally, implementing Content Security Policy (CSP) headers can mitigate the impact by restricting script execution sources.