CVE-2025-43291 is a permissions vulnerability in Apple macOS that allows an application to modify protected parts of the file system. The root cause is a permissions misconfiguration or flaw that was addressed by removing the vulnerable code in macOS Sequoia 15.7, Sonoma 14.8, and Tahoe 26. The vulnerability does not require privileges (PR:N) but does require user interaction (UI:R), meaning a user must run or interact with a malicious app for exploitation. The attack vector is local (AV:L), indicating the attacker needs local access to the system. The vulnerability impacts system integrity (I:H) but does not affect confidentiality or availability. This means an attacker could alter critical system files or configurations, potentially enabling persistence, privilege escalation, or disruption of system functions. The vulnerability is categorized under CWE-284 (Improper Access Control), highlighting the failure to enforce correct permissions on sensitive resources. No known exploits have been reported in the wild, but the medium CVSS score of 5.5 reflects moderate risk due to the need for user interaction and local access. The vulnerability affects multiple macOS versions prior to the patched releases, putting users of those versions at risk. The fix involves removing the vulnerable code segment that allowed unauthorized file system modifications. Organizations relying on macOS endpoints should prioritize patching and monitor for suspicious app behavior that attempts to modify protected file system areas.

The primary impact of CVE-2025-43291 is on the integrity of macOS systems. An attacker who successfully exploits this vulnerability can modify protected parts of the file system, potentially leading to unauthorized changes in system files or configurations. This can facilitate persistence of malware, tampering with security controls, or disruption of normal system operations. Although confidentiality and availability are not directly impacted, the integrity compromise can indirectly lead to broader security issues, including privilege escalation or bypassing security mechanisms. For organizations worldwide, this vulnerability poses a risk to endpoint security, especially in environments with sensitive data or critical infrastructure relying on macOS devices. Attackers could leverage this flaw to implant backdoors or manipulate system behavior, complicating incident response and forensic investigations. The requirement for local access and user interaction limits remote exploitation but does not eliminate risk, particularly in scenarios involving social engineering or insider threats. Failure to patch could result in targeted attacks against enterprises, developers, or high-value macOS users.

1. Immediately update all macOS systems to the patched versions: Sequoia 15.7, Sonoma 14.8, or Tahoe 26, as applicable. 2. Restrict installation of applications to trusted sources such as the Apple App Store or verified developers to reduce the risk of malicious apps exploiting this vulnerability. 3. Implement endpoint protection solutions capable of monitoring and blocking unauthorized attempts to modify protected file system areas. 4. Educate users about the risks of running untrusted applications and the importance of avoiding suspicious prompts that require interaction. 5. Employ application whitelisting and sandboxing to limit the capabilities of apps and prevent unauthorized file system modifications. 6. Regularly audit system integrity using file integrity monitoring tools to detect unauthorized changes to critical system files. 7. Enforce strict access controls and least privilege principles to minimize the potential impact of local attackers. 8. Monitor logs and system behavior for signs of exploitation attempts or unusual file system modifications. 9. For organizations with macOS fleet management, use Mobile Device Management (MDM) solutions to enforce patch compliance and application control policies. 10. Stay informed about any emerging exploits or additional patches related to this vulnerability.