CVE-2026-39875 in macOS
Summary
by MITRE • 07/28/2026
A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A malicious app may be able to gain root privileges.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical permissions flaw that enables malicious applications to escalate their privileges to root level access within Apple's operating systems. The issue stems from insufficient access controls and inadequate privilege separation mechanisms that allow unauthorized applications to bypass normal security boundaries. Such a weakness fundamentally undermines the core security architecture of macOS, where user-space applications should remain isolated from system-level operations. The vulnerability affects multiple versions including macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, and macOS Tahoe 26.6, indicating it likely resides in foundational system components rather than being a version-specific quirk.
The technical nature of this flaw aligns with common privilege escalation vectors found in operating system security models, particularly those involving insufficient input validation or improper access control checks during system calls. This type of vulnerability typically manifests when applications can manipulate system resources through flawed permission checking mechanisms, potentially exploiting kernel-level functions or system APIs that should be restricted to privileged processes only. The vulnerability could involve weaknesses in the system's entitlements model, code signing verification, or sandboxing enforcement mechanisms that normally prevent malicious software from accessing root capabilities.
The operational impact of this vulnerability is severe and directly threatens the integrity of affected systems. A malicious application that successfully exploits this permissions issue can execute arbitrary code with full administrative privileges, effectively compromising the entire system. This level of access enables attackers to modify system files, install persistent backdoors, exfiltrate sensitive data, and potentially establish command and control channels for further exploitation. The vulnerability creates a pathway for attackers to bypass standard security measures including System Integrity Protection, which is designed to prevent modifications to critical system components.
From a cybersecurity perspective, this vulnerability maps closely to several ATT&CK framework techniques including privilege escalation through malicious code execution and persistence mechanisms. The affected systems are particularly vulnerable to attack chains that begin with initial compromise through social engineering or exploit delivery, followed by privilege escalation to achieve root access. Organizations should treat this as a critical security concern given the potential for complete system compromise. Remediation efforts must include immediate deployment of the patched versions mentioned in the advisory, along with comprehensive system monitoring to detect any signs of exploitation attempts.
The vulnerability also highlights issues related to CWE categories such as CWE-276, which addresses improper permissions and access control mechanisms. This weakness demonstrates how insufficient privilege separation can create attack vectors that allow applications to perform operations they should not be permitted to execute. Security professionals must consider this vulnerability within the broader context of supply chain security and application trust models, particularly when evaluating third-party software installations or system configurations that might inadvertently expose these pathways to exploitation.
Organizations should implement immediate mitigations including network segmentation, enhanced endpoint detection capabilities, and regular security assessments to identify potentially compromised systems. The patch deployment process must be prioritized across all affected platforms, with particular attention to ensuring system integrity verification post-upgrade. Additionally, security teams should monitor for indicators of compromise related to unauthorized root access attempts or unusual system behavior that might indicate exploitation of this vulnerability.
The broader implications extend beyond immediate remediation efforts, as this vulnerability demonstrates the ongoing challenges in maintaining secure operating system environments. It underscores the importance of continuous security validation, regular patch management processes, and robust application security practices. System administrators should implement multi-layered defense strategies including behavioral monitoring, access control reviews, and regular security audits to prevent exploitation of similar vulnerabilities in other system components. This vulnerability serves as a reminder that even minor permission inconsistencies can create significant security risks in complex operating system architectures.
This issue represents a critical gap in macOS security controls that requires immediate attention from all stakeholders. The potential for root privilege escalation creates a serious threat vector that could enable comprehensive system compromise and data breaches. Organizations must prioritize patch deployment while simultaneously implementing enhanced monitoring to detect any exploitation attempts. The vulnerability demonstrates the ongoing need for rigorous security testing of operating system components and highlights the importance of maintaining up-to-date security measures across all system versions to prevent similar issues from arising in the future.