CVE-2026-84584 in macOS
Summary
by MITRE • 09/15/2026
This issue was addressed with improved handling of symlinks. This issue is fixed in macOS Golden Gate 27. An app may be able to break out of its sandbox.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the operating system's handling of symbolic links, specifically within the context of application sandboxes on macOS. Symbolic links are special types of files that act as pointers or references to other files or directories. In secure computing environments, particularly those employing sandboxing mechanisms like Apple’s App Sandbox, strict controls are enforced to prevent applications from accessing resources outside their designated scope. The flaw arises when the system fails to properly validate or resolve these symbolic link targets before granting file access permissions. This oversight allows an application to potentially bypass the intended restrictions by manipulating how paths are resolved during runtime operations.
When a sandboxed app attempts to access a resource, it typically does so through a path that is checked against its entitlements and allowed directories. If the system processes a symbolic link without adequately verifying whether the final target of that link resides within an authorized area, the application can effectively trick the security layer into granting access to restricted files or directories. This mechanism relies on the principle of least privilege, which dictates that software should only have access to the data and resources necessary for its function. By exploiting the improper symlink handling, a malicious actor could read sensitive user data, modify system configurations, or execute unauthorized code paths that were previously inaccessible due to sandbox boundaries.
The operational impact of this vulnerability is significant because it undermines one of the primary defenses against malware and untrusted software on macOS systems. Sandboxing is designed to contain damage in case an application is compromised; if a bug allows escape from this container, the attacker gains broader access to the system environment. This could lead to data exfiltration, privilege escalation, or further lateral movement within the network depending on the user's privileges and connected services. The issue was addressed by improving the validation logic for symbolic links, ensuring that any path resolution respects sandbox constraints regardless of intermediate link structures.
This type of flaw is commonly categorized under CWE-59 Improper Link Resolution Before File Access, which highlights risks associated with insufficient checks when resolving file paths containing symlinks. From a threat intelligence perspective, such vulnerabilities align with ATT&CK techniques related to Defense Evasion and Privilege Escalation, specifically those involving path traversal or bypassing application controls. Mitigation strategies primarily involve applying the provided software updates that patch these logic errors in link resolution routines. Administrators should ensure all macOS devices are updated to version Golden Gate 27 or later where this fix is implemented. Additionally, organizations can enforce strict sandbox policies and monitor for unusual file access patterns that might indicate exploitation attempts of similar symlink-based vulnerabilities.