CVE-2025-24100 is a logic-based vulnerability identified in Apple macOS that allows an application to potentially access a user's contacts without proper authorization. The root cause is a logic issue related to insufficient enforcement of access restrictions on contact data, categorized under CWE-1284 (Improper Access Control). This vulnerability affects multiple macOS versions prior to Sequoia 15.3, Sonoma 14.7.3, and Ventura 13.7.3, where Apple implemented improved restrictions to mitigate the issue. The vulnerability requires an attacker to have local access with limited privileges (PR:L) but does not require user interaction (UI:N), making it easier to exploit once local access is obtained. The impact is limited to confidentiality (C:L), as the attacker can read contact information but cannot modify data or disrupt system availability. The CVSS v3.1 base score is 3.3, reflecting low severity due to the limited scope and impact. No known exploits have been reported in the wild, indicating this is a theoretical risk currently. The vulnerability highlights the importance of strict access control enforcement in protecting sensitive user data such as contacts, which can contain personally identifiable information and be leveraged for social engineering or further attacks.

The primary impact of CVE-2025-24100 is unauthorized disclosure of user contact information, which can compromise user privacy and potentially facilitate targeted phishing or social engineering attacks. While the vulnerability does not affect system integrity or availability, exposure of contact data can lead to reputational damage for organizations and individuals, especially those handling sensitive or confidential communications. For enterprises, this could mean leakage of business contacts or client information, increasing the risk of spear-phishing campaigns. Since exploitation requires local access with limited privileges, the threat is more relevant in scenarios where attackers have already gained some foothold on a device, such as through malware or insider threats. The absence of user interaction requirement lowers the barrier for exploitation once access is achieved. Overall, the impact is moderate in privacy terms but low in terms of system compromise or operational disruption.

Organizations and users should promptly update affected macOS systems to versions Sequoia 15.3, Sonoma 14.7.3, or Ventura 13.7.3 where the vulnerability is patched. Beyond patching, implement strict endpoint security controls to prevent unauthorized local access, including enforcing strong user authentication, limiting user privileges, and employing endpoint detection and response (EDR) solutions to detect suspicious activities. Regularly audit installed applications and restrict app permissions to the minimum necessary, especially for apps that request access to contacts. Employ application whitelisting and sandboxing to reduce the risk of malicious or unauthorized apps exploiting this vulnerability. Additionally, educate users about the risks of installing untrusted software and the importance of reporting suspicious behavior. For organizations, consider network segmentation and monitoring to limit lateral movement if a device is compromised. Finally, maintain up-to-date backups and incident response plans to quickly address any potential data exposure incidents.