CVE-2026-84600 in iOS
Summary
by MITRE • 09/15/2026
An authorization issue was addressed with improved state management. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. A malicious shortcut may be able to send messages without user confirmation.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a critical authorization flaw within the automation framework of Apple's operating systems, specifically affecting iOS, iPadOS, macOS, tvOS, visionOS, and watchOS in their respective version 27 releases. The core technical issue stems from inadequate state management during the execution of automated workflows known as Shortcuts. In a properly secured system, actions that interact with external services or sensitive user data, such as sending messages via iMessage or other messaging applications, should require explicit user confirmation to prevent unauthorized operations. However, due to this flaw in how application states are tracked and validated during automation sequences, the system fails to enforce these necessary security checkpoints under specific conditions.
From a technical perspective, this represents a failure in enforcing access control policies at runtime. When a maliciously crafted Shortcut is executed, it can exploit the gap between state initialization and action execution. The operating system incorrectly assumes that prior user interactions or implicit permissions are sufficient for subsequent actions within the same automation chain, thereby bypassing the interactive confirmation dialog that would normally appear before sending a message to another party. This allows an attacker who has persuaded a user to run such a Shortcut to send messages without any further interaction from the victim. The flaw is not necessarily in the messaging application itself but rather in the orchestration layer that manages these automated tasks, highlighting how complex state transitions can introduce security gaps if not rigorously validated against trust boundaries.
The operational impact of this vulnerability is significant for user privacy and communication integrity. An attacker could leverage this to send spam messages, phishing links, or malicious content from a victim's device without their knowledge at the moment of transmission. This undermines the principle of least privilege by allowing actions that should require explicit consent to proceed silently. Furthermore, it poses a risk of reputational damage for the user and potential financial loss if used in social engineering attacks where trust is exploited through compromised communication channels. The ability to send messages without confirmation also complicates forensic analysis, as traditional logs may not clearly distinguish between automated bulk sending and legitimate individual actions unless detailed audit trails are maintained by the underlying framework.
This issue aligns with CWE-269, which classifies Improper Privilege Management or Authorization Bypass through State Manipulation. It reflects a scenario where an actor is able to bypass expected controls due to improper handling of application state during workflow execution. In terms of threat modeling and adversary behavior, this vulnerability facilitates techniques associated with ATT&CK ID T1566.002, specifically Spearphishing via Shortcuts or Automation Tools. Attackers often use social engineering to trick users into installing or running malicious shortcuts that appear benign but contain hidden payloads designed to exfiltrate data or perform unauthorized actions like sending messages. The lack of user confirmation removes a critical layer of defense-in-depth, making it easier for adversaries to operate stealthily within the device's ecosystem.
Mitigation strategies primarily involve applying the provided software updates from Apple in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, and watchOS 27. These patches address the root cause by improving state management logic to ensure that every action requiring user interaction triggers a confirmation prompt regardless of its position within an automation sequence. For organizations managing fleets of devices, it is imperative to prioritize these updates through mobile device management solutions to reduce exposure across all endpoints. Additionally, users should exercise caution when installing shortcuts from untrusted sources and review the permissions granted to automation tools regularly. Security awareness training can help employees recognize suspicious requests to run automated workflows that promise convenience but may harbor malicious intent behind bypassed security controls.