CVE-2025-11594 identifies a vulnerability in the ywxbear PHP-Bookstore-Website-Example, specifically in the /index.php file's Quantity Handler component. The flaw arises from improper validation of the quantity input parameter, allowing attackers to specify arbitrary quantities without restrictions. This can lead to business logic issues such as ordering excessive or negative quantities, potentially causing inventory mismanagement, financial discrepancies, or denial of service through resource exhaustion. The vulnerability can be exploited remotely without requiring authentication or user interaction, increasing its risk profile. The product follows a rolling release model, which complicates version tracking and patch management, and no official patches or updates have been released at the time of publication. The CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P) reflects network attack vector, low complexity, no privileges or user interaction needed, no confidentiality or availability impact, but partial integrity impact, and a proof-of-concept exploit is publicly available. Although no known exploits are actively observed in the wild, the public disclosure increases the likelihood of exploitation attempts. This vulnerability primarily threatens the integrity of order processing and inventory management in affected PHP-based bookstore websites or similar e-commerce applications using this codebase or its derivatives.

For European organizations, the impact of CVE-2025-11594 centers on potential business logic abuse and financial loss. Attackers could manipulate order quantities to cause inventory inaccuracies, leading to stockouts or overcommitments. This may disrupt supply chains and customer satisfaction, especially for online retailers relying on automated order processing. Fraudulent orders with inflated quantities could result in financial losses or logistical challenges. While the vulnerability does not directly compromise confidentiality or availability, the integrity breach can undermine trust in e-commerce platforms. Organizations with integrated inventory and accounting systems may face cascading effects, complicating reconciliation and auditing processes. The ease of remote exploitation without authentication increases the threat surface, particularly for smaller businesses or developers using the vulnerable PHP-Bookstore-Website-Example as a base for their storefronts. Given the rolling release nature and lack of patches, organizations may struggle to apply timely fixes, prolonging exposure.

To mitigate CVE-2025-11594, organizations should implement strict server-side validation and sanitization of all quantity inputs in the /index.php Quantity Handler component. This includes enforcing numeric type checks, minimum and maximum allowable values, and rejecting negative or zero quantities. Employ input validation libraries or frameworks that provide robust filtering mechanisms. Conduct thorough code reviews focusing on business logic related to order processing and quantity handling. Monitor order data for anomalies such as unusually large quantities or repeated suspicious patterns that may indicate exploitation attempts. If possible, apply web application firewalls (WAFs) with custom rules to detect and block malformed or suspicious quantity parameters. Engage with the vendor or community to track updates or patches, and consider isolating or restricting access to vulnerable components until remediation is available. Additionally, implement logging and alerting on quantity-related transactions to facilitate rapid incident response.