A high-severity downgrade vulnerability in Apple macOS allows locally authenticated applications to bypass security protections and access sensitive user data.

This is a privilege-related downgrade flaw where an application can circumvent code-signing restrictions. The vulnerability requires a local attacker with standard user privileges to execute the malicious application on the target system.

The ability for a malicious application to access sensitive user data poses a significant risk to organizational confidentiality. If exploited, an attacker could exfiltrate private credentials, documents, or proprietary information stored on the affected Mac device. With a CVSS score of 7.5, this vulnerability is categorized as High severity, necessitating prompt attention to prevent unauthorized data exposure.

Immediate Action: Update all Intel-based Mac systems to the latest versions of macOS Sequoia (15.7.2), Sonoma (14.8.2), or Tahoe (26.1) as specified in the Apple security advisory.

Proactive Monitoring: Review system logs for unusual application behavior or unauthorized attempts to access sensitive directories such as the Keychain or user document folders.

Compensating Controls: Enforce strict application whitelisting policies to ensure that only authorized and verified software can be executed on endpoints, reducing the risk of a malicious app triggering this flaw.

Public Exploit Available: No

Given the potential for sensitive data exfiltration, organizations should prioritize patching their Intel-based macOS fleet. While the attack requires local execution, the impact on user privacy and data integrity is substantial. Ensure that all systems are updated to the versions listed above to remediate the underlying code-signing bypass.