CVE-2026-86928 in macOS
Summary
by MITRE • 10/20/2026
A path handling issue was addressed with improved validation. This issue is fixed in macOS Golden Gate 27. An app may be able to access protected user data.
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Analysis
by VulDB Data Team • 10/20/2026
The vulnerability described involves a critical flaw in how the operating system handles file paths, specifically within the context of macOS security architecture known as Golden Gate. Path handling issues often arise when an application fails to properly validate or sanitize input before using it to construct file system operations. In this specific instance, the lack of rigorous validation allows an attacker to manipulate path strings, potentially bypassing intended access controls. This type of flaw is classically associated with CWE-22 Improper Limitation of a Pathname to a Restricted Directory, where insufficient checks on user-supplied input enable traversal beyond authorized boundaries or access to resources that should remain isolated from the requesting process.
The operational impact of this vulnerability is significant because it directly compromises data confidentiality for macOS users. By exploiting the path handling defect, an unauthorized application can read sensitive files stored in protected directories such as those containing personal documents, credentials, or system configurations. This represents a breach of the principle of least privilege and undermines the sandboxing mechanisms designed to isolate applications from one another and from core system resources. The ability to access protected user data means that malicious software could exfiltrate private information without triggering standard security alerts associated with more obvious intrusion attempts, thereby increasing the risk of identity theft or further lateral movement within a compromised environment.
Apple addressed this issue in macOS Golden Gate 27 by implementing improved validation logic for path operations. This fix likely involves stricter checks on symbolic links, relative paths, and special characters that could be used to redirect file access requests away from their intended targets. By enforcing these constraints at the kernel or system service level, Apple ensures that applications are restricted to accessing only those files explicitly permitted by user permissions and app sandboxing policies. This remediation aligns with industry best practices for secure coding, emphasizing the necessity of validating all external inputs before they interact with sensitive file systems.
From a threat intelligence perspective, this vulnerability could be leveraged in attacks categorized under MITRE ATT&CK techniques such as T1083 File and Directory Discovery or T1560 Collected Data Archive. Attackers might use this flaw to gather reconnaissance data about the victim's system structure before executing more destructive payloads like ransomware or spyware. Organizations should ensure that all macOS devices are updated to version Golden Gate 27 or later to mitigate this risk. Additionally, administrators should enforce strict application signing and code integrity checks to prevent unsigned or maliciously modified applications from exploiting such path traversal weaknesses in the first place. Regular auditing of app permissions and monitoring for unusual file access patterns can further reduce the attack surface associated with these types of vulnerabilities.