CVE-2024-27799 is a security vulnerability identified in Apple’s iOS and iPadOS platforms, as well as certain macOS versions, where an unprivileged application can log keystrokes from other applications, including those that utilize secure input mode designed to protect sensitive user input such as passwords. Secure input mode is intended to prevent keylogging by isolating input from other apps, but this vulnerability bypasses those protections due to insufficient entitlement checks. The flaw allows a malicious app without elevated privileges to capture keystroke data, potentially exposing sensitive information entered by users. Apple addressed this issue by implementing additional entitlement checks that restrict which apps can access such input data. The fix was released in iOS 16.7.8, iPadOS 16.7.8, macOS Monterey 12.7.5, macOS Sonoma 14.5, and macOS Ventura 13.6.7. The vulnerability has a CVSS v3.1 base score of 3.3, indicating low severity, primarily because exploitation requires local access (attack vector: local), low complexity, no privileges required, but user interaction is necessary. There are no known exploits in the wild at this time. This vulnerability highlights a critical privacy concern where malicious apps could surreptitiously capture sensitive user input across apps, undermining the security guarantees of secure input mode.

The primary impact of CVE-2024-27799 is the potential compromise of user privacy and confidentiality. If exploited, malicious apps could capture sensitive keystrokes such as passwords, credit card numbers, or other confidential information entered into secure input fields across different applications. This could lead to unauthorized access to user accounts, financial fraud, identity theft, and broader privacy violations. Although the vulnerability does not affect system integrity or availability, the confidentiality breach can have severe consequences for individuals and organizations relying on Apple devices for secure communications and transactions. The requirement for local access and user interaction limits the scope of exploitation, but targeted attacks against high-value users or organizations remain a concern. Enterprises with BYOD policies or those deploying iOS/iPadOS devices in sensitive environments should be particularly vigilant. The absence of known exploits reduces immediate risk but does not eliminate the threat of future weaponization.

To mitigate CVE-2024-27799, organizations and users should promptly update all affected Apple devices to the fixed versions: iOS 16.7.8, iPadOS 16.7.8, macOS Monterey 12.7.5, macOS Sonoma 14.5, and macOS Ventura 13.6.7. Beyond patching, organizations should enforce strict app installation policies, allowing only apps from trusted sources such as the official Apple App Store with verified developer credentials. Employ Mobile Device Management (MDM) solutions to restrict app permissions and monitor for suspicious app behavior. Educate users about the risks of installing untrusted apps and the importance of applying updates promptly. Additionally, consider deploying endpoint detection and response (EDR) tools capable of identifying anomalous input logging activities. Regularly audit installed applications and remove any that are unnecessary or suspicious. For high-security environments, consider disabling or limiting the use of third-party apps that require extensive input access. Monitoring for unusual network traffic patterns that could indicate data exfiltration of keystroke data may also be beneficial.