CVE-2026-43786 in macOS
Summary
by MITRE • 09/15/2026
This issue was addressed with additional entitlement checks. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to gain root privileges.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a critical privilege escalation flaw within the operating system's entitlement management subsystem, specifically affecting versions of macOS prior to Golden Gate 27, Sequoia 15.8, and Tahoe 26.7. The core technical deficiency lies in insufficient validation checks during the process authorization phase. When an application requests access to protected resources or attempts to execute privileged operations, the system fails to rigorously verify that the requesting entity possesses the necessary entitlements before granting elevated permissions. This oversight allows a maliciously crafted application to bypass standard security boundaries and acquire root-level privileges without proper authentication or user consent.
From a technical perspective, this flaw represents a failure in access control enforcement mechanisms. In modern operating systems like macOS, entitlements serve as digital certificates that define the specific capabilities an app is permitted to exercise. When these checks are inadequate, it creates a pathway for attackers to exploit logic errors within the privilege escalation routines. By manipulating system calls or injecting malicious payloads into legitimate processes with weak validation loops, an attacker can trick the kernel into treating untrusted code as trusted administrative software. This aligns closely with CWE-269, which classifies Improper Privilege Management, and specifically relates to scenarios where a process gains privileges it was not intended to have due to flawed authorization logic.
The operational impact of this vulnerability is severe, as root access provides unrestricted control over the entire system. An attacker who successfully exploits this flaw can install persistent backdoors, modify critical system files, exfiltrate sensitive data from any user account, and disable security tools such as firewalls or endpoint detection systems. Because the exploitation occurs at a low level within the OS kernel environment, it is difficult to detect using standard application-level monitoring. The attacker effectively becomes an administrator with full visibility and control over all hardware resources, network configurations, and stored information, leading to complete compromise of system integrity and confidentiality.
This type of vulnerability often maps to MITRE ATT&CK techniques related to privilege escalation, such as T1068 Exploitation for Privilege Escalation or potentially T1548 Abuse Elevation Control Mechanism if the flaw involves manipulating specific macOS security frameworks like Gatekeeper or SIP (System Integrity Protection). The ability to gain root privileges allows an adversary to move laterally within a network with greater ease and establish long-term access that is resilient to standard user-level remediation efforts.
Mitigation strategies primarily involve immediate software updates. Administrators must ensure all systems are upgraded to macOS Golden Gate 27, Sequoia 15.8, or Tahoe 26.7 where the additional entitlement checks have been implemented and validated. These patches reinforce the authorization logic by ensuring that every request for elevated privileges undergoes strict verification against the app's declared entitlements before any action is taken. In environments where patching cannot be applied immediately, organizations should enforce strict application whitelisting policies to prevent unauthorized or unsigned applications from executing privileged commands. Additionally, enabling enhanced logging and monitoring for unusual privilege escalation attempts can help detect potential exploitation activities in real-time while longer-term security controls are being deployed.