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{}

{"analysis": {"en": {"generated_at": "2026-04-28T22:51:20.612410+00:00", "value": {"mitigation_remediation": ["Install the latest macOS update\u2014Sequoia\u00a015.3, Sonoma\u00a014.7.3 or Ventura\u00a013.7.3\u2014to obtain the fix for the downgrade issue", "Restart the system following the update to ensure the updated code\u2011signing restrictions are active", "Configure Gatekeeper to allow only apps from the App Store or identified developers and use a policy to prevent installation of third\u2011party apps that bypass code\u2011signing restrictions"], "summary": {"action": "Update", "impact": "Privilege Escalation & File System Modification"}, "threat_synthesis": {"affected_systems": "Apple macOS on Intel-based machines. The vulnerability is corrected in macOS Sequoia\u00a015.3, macOS Sonoma\u00a014.7.3 and macOS Ventura\u00a013.7.3. Devices running earlier versions of these releases are susceptible.", "description_and_impact": "An application can modify protected parts of the file system on Intel-based Macs due to a downgrade issue that bypassed code\u2011signing restrictions. The flaw allows the writing of data outside the intended region, potentially overwriting critical system files. This amounts to a privilege escalation and integrity breach, enabling an attacker to install or modify software with elevated privileges.", "risk_and_exploitability": "The CVSS score of 5.5 places the issue in the moderate severity range. The EPSS score of less than\u00a01\u00a0% indicates a very low exploitation probability at the time of this analysis. The vulnerability is not listed in the CISA KEV catalog. The most likely attack vector is the installation of a malicious or compromised application, which can then write through the out\u2011of\u2011bounds write flaw to protected areas of the file system. The risk is mostly theoretical unless an attacker obtains a foothold via a malicious app."}}}}, "created": "2026-04-28T23:00:13.179813+00:00", "title": "MacOS File System Downgrade Privilege Escalation on Intel-Based Macs", "updated": "2026-04-28T23:00:13.179824+00:00", "vendors": []}