CVE-2026-86891 in macOS
Summary
by MITRE • 09/15/2026
An authorization issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, watchOS 27. An app may be able to access Bluetooth device information.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the authorization and state management mechanisms within Apple's operating systems, specifically affecting macOS versions including Golden Gate 27, Sequoia 15.8, and Tahoe 26.7, as well as watchOS version 27. This issue stems from improper handling of session states or access controls related to Bluetooth subsystems. In secure software architecture, state management is critical for ensuring that an application's permissions are correctly validated against the current context of user interaction and system security policies. When this logic fails, it can lead to a situation where an application retains or gains access privileges beyond what was explicitly granted by the user during initial authorization prompts. This type of flaw is commonly categorized under CWE-269, which refers to Improper Privilege Management, as the software does not properly enforce or maintain administrative levels and permissions for users acting in different roles or contexts.
From a technical perspective, Bluetooth interfaces on modern operating systems expose detailed device information such as hardware addresses, service UUIDs, connection states, and potentially paired device identities. These data points are considered sensitive because they can be used to fingerprint devices, track user movement through proximity analysis, or facilitate further attacks like Bluejacking or Bluesnarfming if combined with other vulnerabilities. The flaw allows an app that may have legitimately requested limited Bluetooth access to inadvertently access broader device information than intended. This occurs because the internal state tracking mechanism fails to properly isolate or restrict subsequent requests based on the original scope of permission granted. Consequently, malicious actors could exploit this by crafting applications that request minimal permissions but leverage the flawed state management to extract detailed Bluetooth topology data without explicit user consent for such extensive access.
The operational impact of this vulnerability is significant in terms of privacy and potential security escalation. An attacker who deploys a compromised or malicious application on an affected device can silently gather information about nearby Bluetooth devices, including those belonging to other users if the victim's device has previously paired with them or scanned their signals. This data collection violates user expectations of privacy and could be used for targeted phishing campaigns where knowledge of specific hardware models or connected peripherals aids in crafting convincing social engineering attacks. Furthermore, persistent access to Bluetooth state information can enable long-term tracking capabilities, allowing adversaries to monitor the presence and movement patterns of target devices within range. While this vulnerability alone may not allow direct code execution or full system compromise, it serves as a critical reconnaissance vector that lowers the barrier for more sophisticated exploits targeting specific device configurations or connected peripherals like smartwatches, headphones, or automotive systems.
Mitigation strategies primarily involve applying the provided software updates which address these state management deficiencies in macOS and watchOS environments. Administrators should ensure that all devices are patched to the latest stable releases mentioned, as Apple has implemented fixes to enforce stricter boundaries on Bluetooth API calls based on declared app capabilities. Beyond patching, users should adhere to the principle of least privilege by carefully reviewing permission requests during application installation or first launch. It is advisable to deny access to sensitive subsystems like Bluetooth unless absolutely necessary for core functionality. Additionally, organizations deploying these devices in enterprise environments should implement mobile device management policies that restrict which applications are permitted to interact with low-level hardware interfaces. Regular auditing of installed applications and their granted permissions can help detect any anomalies where an app exhibits behavior inconsistent with its stated purpose, thereby reducing the attack surface available to potential exploiters leveraging this authorization bypass technique.