CVE-2025-43521: Apple macOS

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

A downgrade issue affecting Intel-based Mac computers was addressed with additional code-signing restrictions. This issue is fixed in macOS Sequoia 15.7.3, macOS Tahoe 26.2. An app may be able to access sensitive user data.

Affected products

• Apple macOS: before 15.7.3 (fixed in 15.7.3)

Published 2025-12-12. Last modified 2026-10-07.