CVE-2024-23892 is a high-severity Cross-Site Scripting (XSS) vulnerability identified in version 1.0 of Cups Easy (Purchase & Inventory), a software product used for purchase and inventory management. The vulnerability arises from improper neutralization of user-supplied input in the web application, specifically in the 'costcenterid' parameter of the /cupseasylive/costcentercreate.php endpoint. Because the input is not sufficiently encoded or sanitized before being included in the web page output, an attacker can craft a malicious URL containing executable script code. When an authenticated user accesses this URL, the malicious script executes in their browser context, potentially allowing the attacker to steal session cookies or perform other unauthorized actions within the user's session. The CVSS 3.1 base score of 8.2 reflects the vulnerability's network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is changed (S:C) because the vulnerability can affect resources beyond the vulnerable component, and the impact is high on confidentiality (C:H), low on integrity (I:L), and none on availability (A:N). Although no public exploits are currently known in the wild, the vulnerability poses a significant risk due to the ease of exploitation and potential for session hijacking. The vulnerability is classified under CWE-79, which covers improper neutralization of input leading to XSS attacks. No patches or fixes have been linked yet, indicating that affected organizations should prioritize mitigation and monitoring.

For European organizations using Cups Easy (Purchase & Inventory) version 1.0, this vulnerability presents a serious risk to the confidentiality of user sessions and sensitive business data. Successful exploitation could allow attackers to hijack authenticated user sessions, potentially gaining unauthorized access to purchase and inventory records, financial data, or internal business processes. This could lead to data breaches, fraud, or manipulation of inventory and purchase records. Given that the attack requires sending a malicious URL to an authenticated user, phishing or social engineering campaigns could be used to facilitate exploitation. The impact is particularly critical for organizations handling sensitive or regulated data, such as those in finance, manufacturing, retail, or supply chain sectors. Additionally, compromised sessions could be leveraged to move laterally within corporate networks or escalate privileges. The lack of availability impact means the system remains operational, but confidentiality breaches can have long-term reputational and compliance consequences under regulations like GDPR.

1. Immediate mitigation should include educating users about the risks of clicking on suspicious links, especially those received via email or messaging platforms. 2. Implement web application firewall (WAF) rules to detect and block malicious payloads targeting the 'costcenterid' parameter. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 4. Restrict access to the vulnerable endpoint to trusted IP ranges or VPN users where feasible. 5. Monitor web server logs for unusual requests containing script tags or suspicious parameter values. 6. If possible, apply input validation and output encoding at the application level to sanitize the 'costcenterid' parameter, even if a vendor patch is not yet available. 7. Segregate user roles and limit permissions to reduce the impact of session hijacking. 8. Regularly update and patch the application once a vendor fix is released. 9. Consider multi-factor authentication (MFA) to reduce the risk of session misuse. 10. Conduct phishing awareness training to reduce the likelihood of users being tricked into clicking malicious URLs.