CVE-2025-9921 is a cross-site scripting (XSS) vulnerability identified in version 1.0 of the code-projects POS Pharmacy System, specifically within the /main/products.php file. The vulnerability arises due to improper sanitization or validation of user-supplied input parameters such as product_code, gen_name, product_name, and supplier. An attacker can manipulate these parameters remotely to inject malicious scripts into the web application. When a legitimate user accesses the affected page, the injected script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability is exploitable remotely without authentication, but requires user interaction (e.g., visiting a crafted URL). The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:H indicates high privileges required, but this conflicts with the description; likely a data inconsistency), user interaction required (UI:P), and low impact on integrity and no impact on confidentiality or availability, resulting in an overall medium severity score of 4.8. Although no known exploits are currently observed in the wild, a public exploit is available, increasing the risk of exploitation. This vulnerability is critical for web applications handling sensitive pharmacy data, as it could lead to unauthorized access or manipulation of user sessions and data.

For European organizations using the code-projects POS Pharmacy System version 1.0, this XSS vulnerability poses a significant risk to the confidentiality and integrity of user sessions and data. Pharmacy systems often handle sensitive patient and medication information, making them attractive targets for attackers seeking to steal personal health information or disrupt operations. Exploitation could lead to unauthorized access to user accounts, manipulation of pharmacy inventory or sales data, and potential regulatory non-compliance under GDPR due to data breaches. Additionally, successful XSS attacks can be used as a foothold for further attacks within the network, including phishing or malware distribution. The medium severity rating suggests the impact is moderate but should not be underestimated given the sensitive nature of pharmacy systems. European healthcare providers and pharmacies relying on this POS system could face operational disruptions, reputational damage, and legal consequences if the vulnerability is exploited.

To mitigate CVE-2025-9921, European organizations should immediately assess their deployment of code-projects POS Pharmacy System version 1.0 and prioritize upgrading to a patched version once available. In the absence of an official patch, organizations should implement the following specific measures: 1) Apply strict input validation and output encoding on all user-supplied parameters (product_code, gen_name, product_name, supplier) to neutralize malicious scripts. 2) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 3) Use web application firewalls (WAFs) configured to detect and block common XSS attack patterns targeting the affected endpoints. 4) Conduct regular security audits and penetration testing focused on the POS system's web interfaces. 5) Educate users and staff about the risks of clicking on suspicious links and encourage reporting of unusual system behavior. 6) Monitor logs for unusual request patterns that may indicate exploitation attempts. These targeted mitigations go beyond generic advice by focusing on the specific vulnerable parameters and leveraging layered defenses to reduce risk until a vendor patch is available.