CVE-2026-4562 is a security vulnerability identified in MacCMS version 2025.1000.4052, specifically within the Timming API Endpoint component located in the file application/api/controller/Timming.php. The vulnerability arises from missing authentication controls, allowing remote attackers to invoke the API without any credentials or user interaction. This flaw effectively bypasses access controls, potentially enabling unauthorized access to sensitive functions or data exposed by the Timming API. The vulnerability is remotely exploitable over the network without requiring any privileges or user interaction, increasing its risk profile. The CVSS 4.0 base score of 6.9 reflects a medium severity rating, considering the ease of exploitation (attack vector network, low attack complexity), lack of authentication, and the limited impact on confidentiality, integrity, and availability (all rated low). Although no known exploits have been observed in the wild, the public release of exploit code raises the likelihood of attacks. The absence of a patch or official fix at the time of publication necessitates immediate defensive measures. The vulnerability's impact depends on the role of the Timming API within MacCMS deployments, which may include time-based functions or scheduling features critical to application workflows. Attackers exploiting this flaw could manipulate or retrieve data, disrupt service, or leverage the access for further attacks within the affected environment.

The missing authentication vulnerability in MacCMS's Timming API Endpoint can lead to unauthorized remote access, potentially compromising sensitive data or system functions exposed by the API. While the impact on confidentiality, integrity, and availability is rated low individually, the combined effect could allow attackers to manipulate time-related application features or extract information, disrupting normal operations. Organizations relying on MacCMS version 2025.1000.4052 may face increased risk of data leakage, service disruption, or unauthorized changes. The ease of exploitation without authentication or user interaction increases the threat surface, especially if the API is exposed to untrusted networks. The public availability of exploit code further elevates the risk of widespread attacks. This vulnerability could be leveraged as an initial access vector or to escalate privileges within the affected environment. The overall impact is medium severity but could escalate depending on the deployment context and sensitivity of the data or functions exposed by the Timming API.

To mitigate CVE-2026-4562, organizations should immediately restrict access to the Timming API Endpoint by implementing network-level controls such as IP whitelisting or VPN-only access to limit exposure. Deploy Web Application Firewalls (WAFs) with custom rules to detect and block unauthorized API requests targeting the Timming.php endpoint. If possible, disable or remove the Timming API functionality if it is not essential to operations. Implement strong authentication mechanisms around the API, such as OAuth tokens or API keys, to enforce access control. Monitor logs and network traffic for unusual or unauthorized access attempts to the Timming API. Coordinate with the MacCMS vendor or community for patches or updates addressing this vulnerability and apply them promptly once available. Conduct thorough security assessments of MacCMS deployments to identify other potential misconfigurations or vulnerabilities. Educate development and operations teams about the risks of missing authentication and enforce secure coding practices for API development.