CVE-2026-4563 is a medium-severity authorization bypass vulnerability found in MacCMS, a content management system widely used for media and e-commerce applications. The vulnerability resides in the order_info function within the Member Order Detail Interface component, specifically in the file application/index/controller/User.php. By manipulating the order_id argument, an attacker can bypass authorization checks that normally restrict access to order details. This bypass does not require authentication or user interaction, and the attack can be initiated remotely over the network. The vulnerability affects MacCMS versions up to 2025.1000.4052. The CVSS 4.0 vector indicates low complexity (AC:L), no privileges required (PR:L, indicating low privileges but some level of authentication), no user interaction (UI:N), and partial impact on confidentiality (VC:L). The vulnerability does not affect integrity or availability. Although no active exploitation has been reported, a public exploit exists, increasing the likelihood of future attacks. The flaw could allow unauthorized users to view sensitive order information, potentially leading to data leakage or further targeted attacks. The lack of patches at the time of disclosure necessitates immediate mitigation through access restrictions and monitoring. This vulnerability highlights the importance of robust authorization checks and input validation in web applications handling sensitive user data.

The primary impact of CVE-2026-4563 is unauthorized access to order details within MacCMS, which can lead to confidentiality breaches. Attackers exploiting this vulnerability can view sensitive customer order information without proper authorization, potentially exposing personal data, transaction details, and business-sensitive information. This exposure can result in privacy violations, reputational damage, and compliance issues for organizations handling customer data. While the vulnerability does not directly affect system integrity or availability, the leaked information could be leveraged for social engineering, fraud, or further attacks against the organization. Since the vulnerability can be exploited remotely without user interaction, the attack surface is broad, especially for internet-facing MacCMS deployments. Organizations relying on MacCMS for e-commerce or media content management are at risk, particularly if they do not have additional access controls or monitoring in place. The availability of a public exploit increases the urgency to address this vulnerability before attackers can weaponize it at scale.

1. Apply official patches or updates from MacCMS vendors as soon as they become available to address the authorization bypass vulnerability. 2. In the absence of patches, implement strict access controls on the order_info endpoint, restricting access to authenticated and authorized users only. 3. Employ input validation and sanitization on the order_id parameter to prevent manipulation and unauthorized access. 4. Use web application firewalls (WAFs) to detect and block suspicious requests targeting the order_info function, especially those with unusual or malformed order_id values. 5. Monitor logs and network traffic for anomalous access patterns to the Member Order Detail Interface, including repeated or unauthorized attempts to access order details. 6. Conduct regular security audits and penetration testing focusing on authorization mechanisms within MacCMS. 7. Educate developers and administrators on secure coding practices to prevent similar authorization flaws in future releases. 8. Segment and isolate MacCMS deployments within the network to limit exposure to external threats. 9. Implement multi-factor authentication (MFA) for administrative and user accounts to reduce the risk of unauthorized access. 10. Maintain an incident response plan to quickly address any exploitation attempts or breaches related to this vulnerability.