CVE-2025-11594 identifies a vulnerability in the ywxbear PHP-Bookstore-Website-Example, specifically within the Quantity Handler logic processed in /index.php. The vulnerability arises from improper validation of the specified quantity input, allowing attackers to remotely submit manipulated quantity values without requiring authentication or user interaction. This can lead to unintended behavior such as incorrect order quantities, inventory mismanagement, or potential bypass of business rules that rely on quantity validation. The product operates on a rolling release basis, which complicates version tracking and patching, and no official patches or version updates have been disclosed. The CVSS 4.0 vector (AV:N/AC:L/AT:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low attack complexity, no privileges or user interaction needed, no confidentiality or availability impact, but low impact on integrity. Although no known exploits are currently in the wild, the public disclosure of the vulnerability increases the risk of exploitation. The vulnerability primarily threatens the integrity of order processing and inventory data, potentially leading to financial discrepancies or operational disruptions in affected deployments.

For European organizations, especially those operating e-commerce platforms or using PHP-based bookstore solutions derived from or similar to the ywxbear PHP-Bookstore-Website-Example, this vulnerability could lead to manipulation of order quantities. This may result in financial losses due to incorrect billing or inventory errors, undermining customer trust and operational efficiency. While the vulnerability does not directly compromise confidentiality or availability, the integrity issues could cascade into broader business process failures or audit compliance problems. Organizations relying on automated inventory or order management systems are particularly at risk. The lack of authentication requirement and ease of remote exploitation increase the threat surface. Given the rolling release nature of the product, timely patching may be challenging, prolonging exposure. European companies with integrated supply chains or regulatory obligations around transaction accuracy must prioritize addressing this issue to avoid reputational and financial damage.

To mitigate CVE-2025-11594, organizations should implement strict server-side validation of all quantity inputs, ensuring that only valid, expected numeric values within acceptable ranges are processed. Input sanitization must be enforced to reject negative, zero, or excessively large quantities. Business logic should include checks to verify that requested quantities align with available inventory and order policies. Employing web application firewalls (WAFs) with custom rules to detect and block anomalous quantity parameters can provide an additional layer of defense. Regular code audits and penetration testing focused on input validation are recommended. Since no official patches are available, organizations should consider isolating or restricting access to affected components until fixes can be applied. Monitoring logs for unusual order patterns or quantity anomalies can help detect exploitation attempts early. Finally, engaging with the vendor or community for updates on patches or mitigations is advised due to the rolling release model.