CVE-2024-44248 is a vulnerability identified in Apple macOS that allows a user who already has screen sharing access to view another user's screen without proper authorization. The root cause is linked to inadequate state management within the screen sharing component, which fails to correctly isolate user sessions. This flaw enables an attacker with legitimate screen sharing privileges to escalate their visibility beyond their authorized scope, potentially exposing sensitive information displayed on other users' screens. The vulnerability affects macOS versions prior to Ventura 13.7.2 and Sonoma 14.7.2, where Apple has implemented fixes to improve state management and session isolation. The CVSS v3.1 score of 6.5 reflects a medium severity, with an attack vector over the network, low attack complexity, requiring privileges (screen sharing access), no user interaction, and impacting confidentiality only. There is no evidence of active exploitation in the wild as of the publication date. The vulnerability does not compromise system integrity or availability but poses a significant confidentiality risk, especially in multi-user or shared device environments. The issue underscores the importance of strict access controls and session management in remote collaboration tools.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive or confidential information if an attacker gains or abuses screen sharing privileges. Sectors such as finance, healthcare, government, and technology, which often handle sensitive data and rely on macOS devices, are particularly at risk. The confidentiality breach could result in data leaks, intellectual property theft, or exposure of personal data, potentially violating GDPR and other data protection regulations. Organizations with remote work policies or collaborative environments that utilize screen sharing are more vulnerable. Although the vulnerability does not affect system integrity or availability, the reputational damage and regulatory penalties from data exposure could be significant. The lack of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially if attackers develop proof-of-concept exploits. The medium severity rating suggests a moderate but actionable risk that requires timely remediation.

European organizations should immediately update all macOS devices to Ventura 13.7.2, Sonoma 14.7.2, or later versions where the vulnerability is patched. Screen sharing access should be strictly limited to trusted users and roles, employing the principle of least privilege. Organizations should audit current screen sharing permissions and disable the feature where it is not essential. Implement network segmentation and monitoring to detect unusual screen sharing activity. Employ endpoint detection and response (EDR) solutions to identify anomalous behavior related to screen sharing sessions. User training should emphasize the risks of unauthorized screen sharing and encourage reporting of suspicious access. Additionally, organizations should review and enforce strong authentication mechanisms for remote access tools. Regular vulnerability assessments and penetration testing should include checks for improper session isolation in remote collaboration tools. Finally, maintain up-to-date incident response plans to quickly address any potential exploitation.