CVE-2026-20680 is a vulnerability identified in Apple’s macOS and related operating systems (including iOS and iPadOS) that allows a sandboxed application to access sensitive user data. Sandboxing is a security mechanism designed to isolate applications and restrict their access to system resources and user data. However, this vulnerability arises from insufficient restrictions on the observability of app states, which enables a sandboxed app to infer or directly access sensitive information it should not have permission to see. The issue was addressed by Apple through enhanced restrictions on how app states can be observed, effectively closing the information leakage vector. The vulnerability affects multiple Apple OS versions, including macOS Tahoe 26.3, Sonoma 14.8.4, Sequoia 15.7.4, and iOS/iPadOS versions 18.7.5 and 26.3. The CVSS v3.1 base score is 5.5, indicating a medium severity level. The vector string (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) shows that the attack requires local access with low privileges, no user interaction, and results in high confidentiality impact but no integrity or availability impact. The weakness corresponds to CWE-200 (Exposure of Sensitive Information). No known exploits have been reported in the wild, but the vulnerability represents a potential risk for unauthorized data disclosure by malicious or compromised sandboxed apps.

The primary impact of CVE-2026-20680 is unauthorized disclosure of sensitive user data by sandboxed applications on affected Apple operating systems. This can lead to privacy violations, leakage of personal or corporate confidential information, and potential escalation of attacks if sensitive data such as credentials, tokens, or private files are exposed. Since the vulnerability does not affect integrity or availability, it does not allow modification or disruption of system operations. However, the confidentiality breach can facilitate further attacks such as social engineering, targeted phishing, or lateral movement within networks. Organizations relying on Apple devices for sensitive communications, intellectual property, or personal data storage are at risk. The requirement for local access and low privileges limits remote exploitation, but insider threats or malicious apps installed by users remain a concern. The absence of user interaction requirement increases the stealthiness of potential exploitation. Overall, the vulnerability poses a moderate risk to confidentiality, especially in environments with high-value data or strict privacy requirements.

To mitigate CVE-2026-20680, organizations and users should promptly apply the security updates released by Apple for macOS Tahoe 26.3, Sonoma 14.8.4, Sequoia 15.7.4, iOS 18.7.5, iPadOS 18.7.5, and versions 26.3 of iOS and iPadOS. Beyond patching, organizations should enforce strict application installation policies to limit the presence of untrusted or unnecessary sandboxed apps, reducing the attack surface. Employ Mobile Device Management (MDM) solutions to control app permissions and monitor app behavior for anomalous access patterns. Conduct regular audits of installed applications and sandbox configurations to ensure compliance with least privilege principles. Educate users about the risks of installing unverified apps and encourage the use of official app stores. Implement endpoint detection and response (EDR) tools capable of identifying suspicious local activities that may indicate attempts to exploit sandbox weaknesses. Finally, maintain robust data encryption and access controls on sensitive data to minimize exposure even if sandboxed apps gain unauthorized access.