CVE-2026-28853 in macOS
Summary
by MITRE • 10/20/2026
The issue was addressed with improved checks. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to elevate privileges.
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Analysis
by VulDB Data Team • 10/20/2026
This vulnerability represents a critical privilege escalation flaw within the operating system core, specifically affecting versions of macOS prior to Sequoia 15.8 and Tahoe prior to 26.7. The root cause lies in insufficient validation checks during specific system operations that handle access control decisions. When an application interacts with these subsystems, it can exploit logical errors or race conditions inherent in the permission verification process. By manipulating input parameters or timing requests precisely, a malicious actor running unprivileged code can bypass standard security boundaries. This allows the application to execute actions reserved for higher-privilege entities, effectively gaining administrative control over the system without proper authentication credentials.
The operational impact of this flaw is severe because it undermines the fundamental principle of least privilege that protects macOS environments. Once an attacker successfully elevates privileges, they are no longer constrained by sandboxing restrictions or user-level permissions. This grants them unrestricted read and write access to sensitive files, including kernel extensions, system configurations, and other users' data. Furthermore, elevated privileges enable the installation of persistent malware, such as rootkits or keyloggers, which can survive reboots and evade standard detection mechanisms. The attacker could also disable security features like Gatekeeper or FileVault, leaving the device completely exposed to further exploitation and lateral movement within a networked environment.
From a classification perspective, this vulnerability aligns with CWE-269 Improper Privilege Management, where software does not properly assign privileges based on user roles or identities. It also relates closely to CWE-862 Missing Authorization, as the system fails to enforce access control policies during critical operations. In terms of adversary tactics, this flaw facilitates techniques described in the MITRE ATT&CK framework under privilege escalation vectors, specifically those involving local exploitation of operating system flaws. Attackers would typically leverage this vulnerability after gaining initial foothold through phishing or web-based exploits to achieve full system compromise and establish persistence for long-term access.
Mitigation strategies must prioritize immediate patching as the primary defense vector. Organizations should enforce automated update policies to ensure all endpoints are running macOS Sequoia 15.8 or later, along with Tahoe 26.7 or newer versions where applicable. For environments unable to upgrade immediately due to compatibility constraints, strict application whitelisting and enhanced monitoring of system calls related to privilege changes can help detect exploitation attempts in real time. Security teams should also review audit logs for unusual spikes in process creation by non-administrative users attempting to access protected resources. Regular vulnerability scanning focused on operating system components remains essential to identify unpatched instances before they are targeted by automated exploit kits commonly found in the wild.