CVE-2026-86911 in macOS
Summary
by MITRE • 09/15/2026
This issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27. A malicious app may be able to bypass clickjacking protections for secure prompts.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the state management mechanisms within the operating system, specifically affecting how user interface elements and security prompts are rendered and handled during interaction. This issue was identified as allowing a malicious application to circumvent built-in clickjacking protections that are designed to prevent deceptive UI redressing attacks. Clickjacking is a technique where an attacker tricks a user into clicking on something different from what the user perceives, often by overlaying transparent or opaque elements over legitimate interface components. In this specific context, the flaw relates to secure prompts, which are critical system-level dialogs that require explicit user consent for sensitive operations such as granting permissions, accessing private data, or executing privileged actions.
The core technical deficiency lies in how the operating system manages the state of these security prompts when they are presented by applications. Proper state management ensures that a prompt remains visually and functionally isolated from other UI elements, preventing external overlays from intercepting user input or altering the perceived context of the action being taken. When this state is not correctly maintained, an attacker can exploit race conditions or rendering inconsistencies to place deceptive layers over these prompts. This allows the malicious app to manipulate the user into confirming actions they did not intend to perform, effectively bypassing the intended security boundaries established by the operating system's design.
The operational impact of this vulnerability is significant because it undermines a fundamental trust mechanism in modern computing environments. Secure prompts serve as the last line of defense against unauthorized access and privilege escalation. By bypassing clickjacking protections for these prompts, an attacker can coerce users into granting elevated permissions or exposing sensitive information without their genuine knowledge or consent. This could lead to data exfiltration, installation of further malware, or complete compromise of user accounts and system integrity. The severity is heightened by the fact that it targets a security feature specifically designed to protect against social engineering attacks, making it particularly dangerous in scenarios where users are already being manipulated through deceptive interfaces.
This vulnerability aligns with CWE-1021: Improper Restriction of Rendered UI Layers or Frames, which covers issues related to clickjacking and UI redressing. It also relates to ATT&CK technique T1568: Dynamic Resolution Adaptation, where attackers may manipulate display settings or rendering contexts to hide malicious activities from the user's view. The fix implemented in macOS Golden Gate 27 addresses these state management errors by ensuring that secure prompts are rendered with proper isolation and integrity checks. This prevents external applications from injecting deceptive layers over system dialogs and ensures that user interactions are accurately captured and processed without interference.
To mitigate such risks, users should ensure their operating systems are updated to the latest versions containing security patches like those in macOS Golden Gate 27. Additionally, developers must adhere to strict UI rendering guidelines that prevent overlaying sensitive prompts with external content. Security awareness training can also help users recognize signs of deceptive interfaces, although technical fixes remain the primary defense against automated exploitation attempts. The resolution emphasizes the importance of robust state management in security-critical components and highlights the ongoing need for rigorous testing of user interface interactions to prevent bypasses that could compromise system trustworthiness.