CVE-2025-24140: 
macOS vulnerability analysis and mitigation

A vulnerability was discovered in macOS Sequoia affecting the iCloud component, identified as CVE-2025-24140. The issue was reported by Matej Moravec (@MacejkoMoravec) and involves files downloaded from the internet potentially not having the quarantine flag applied. This vulnerability was addressed in macOS Sequoia 15.3, released on January 27, 2025 (Apple Security).

The vulnerability stems from a state management issue in the iCloud component of macOS Sequoia. When files are downloaded from the internet, the system may fail to properly apply the quarantine flag, which is a security measure designed to mark files from untrusted sources (Apple Security).

The absence of quarantine flags on downloaded files could potentially allow malicious files to bypass security measures that normally protect users from untrusted content downloaded from the internet (Apple Security).

No public exploits or active exploitation of this vulnerability have been reported at the time of disclosure (Apple Security).

Apple has addressed this vulnerability through improved state management in macOS Sequoia 15.3. Users are advised to update their systems to this version to receive the security fix (Apple Security).