CVE-2000-0123 is a high-severity vulnerability affecting the shopping cart application provided with Filemaker. This vulnerability allows remote attackers to manipulate sensitive purchase information by modifying hidden form fields within the application. Since the shopping cart relies on client-side hidden fields to store purchase data, an attacker can intercept and alter these fields during transmission, leading to unauthorized changes in purchase details such as prices, quantities, or product selections. The vulnerability is exploitable over the network without requiring any authentication (AV:N/AC:L/Au:N), making it relatively easy to exploit. The impact spans confidentiality, integrity, and availability: confidentiality is compromised as sensitive purchase data can be exposed or altered; integrity is affected because attackers can modify transaction details; and availability could be indirectly impacted if manipulated transactions disrupt business operations. No patches or fixes are available for this vulnerability, and no known exploits have been reported in the wild. Given the age of the vulnerability (published in 2000), it likely affects legacy Filemaker shopping cart applications that have not been updated or replaced. The lack of authentication and ease of exploitation make this a significant risk for organizations still using this software component in their e-commerce infrastructure.

For European organizations, this vulnerability poses a risk primarily to those still operating legacy Filemaker shopping cart applications. The ability for remote attackers to alter purchase information can lead to financial losses, fraudulent transactions, and erosion of customer trust. Confidentiality breaches could expose customer purchase data, potentially violating GDPR requirements and leading to regulatory penalties. Integrity compromises may result in incorrect billing or inventory discrepancies, disrupting supply chains and accounting processes. Availability impacts, while indirect, could arise from operational disruptions caused by fraudulent or manipulated transactions. Organizations in sectors with high e-commerce activity, such as retail, wholesale, and manufacturing, are particularly vulnerable. Furthermore, the absence of patches means that mitigation relies heavily on compensating controls, increasing operational overhead. The reputational damage and potential legal consequences in the European context heighten the severity of this threat.

Given that no patches are available, European organizations should implement the following specific mitigations: 1) Replace or upgrade legacy Filemaker shopping cart applications with modern, secure e-commerce platforms that enforce server-side validation and do not rely on client-side hidden fields for sensitive data. 2) Implement strict server-side input validation and verification to ensure that purchase data cannot be tampered with via client-side manipulation. 3) Employ transport layer security (TLS) to protect data in transit and reduce the risk of interception and modification. 4) Use application-layer encryption or digital signatures on purchase data to detect unauthorized changes. 5) Monitor transaction logs for anomalies indicative of tampering, such as unusual price changes or quantity modifications. 6) Educate development and operations teams about the risks of relying on client-side controls for sensitive data. 7) If immediate replacement is not feasible, deploy web application firewalls (WAFs) with custom rules to detect and block suspicious modifications to form fields. 8) Conduct regular security assessments and penetration testing focused on e-commerce transaction integrity.