CVE-2026-84621 in iOS
Summary
by MITRE • 09/15/2026
An authorization issue was addressed with improved access control. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to access sensitive user data.
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Analysis
by VulDB Data Team • 09/15/2026
The disclosed vulnerability represents a critical failure in the operating system's authorization mechanisms, specifically within the iOS and iPadOS platforms as well as associated macOS environments including Sequoia, Golden Gate, and Tahoe variants. This flaw stems from an improper implementation of access control policies that govern how applications interact with user data stores. In a properly secured environment, every request for sensitive information must be rigorously validated against the application's declared permissions and the explicit consent granted by the end-user during installation or runtime configuration. However, in this instance, the system failed to enforce these boundaries effectively, allowing an unauthorized process to bypass standard security checks. This type of defect is classically categorized under CWE-269, which denotes Improper Control of Interaction with External Component, and more specifically aligns with CWE-862 regarding Missing Authorization logic where the software does not perform necessary access control checks before granting privileges.
From an operational perspective, this vulnerability enables a malicious or compromised application to read sensitive user data that it should strictly be prohibited from accessing. The scope of affected data typically includes personal identifiers, health records, location history, messages, and other private information stored in protected containers on the device. Because modern mobile operating systems rely heavily on sandboxing to isolate applications, this breach indicates a significant erosion of that isolation boundary. An attacker leveraging this flaw could exfiltrate confidential information without triggering standard security alerts or requiring additional user interaction such as biometric authentication or password entry. This capability significantly increases the risk profile for users, particularly those handling sensitive professional or personal data on their devices.
The attack vector associated with this vulnerability is likely local and requires the installation of a malicious application that exploits the flawed authorization logic to escalate its privileges beyond what was originally granted. In terms of the MITRE ATT&CK framework, this behavior maps directly to T1530 Data from Local System which involves reading data from local storage on compromised endpoints. It may also intersect with T1078 Valid Accounts if an attacker uses legitimate but misconfigured credentials or app entitlements to maintain persistence and access. The impact is severe as it compromises the confidentiality of user data, potentially leading to identity theft, financial fraud, or espionage depending on the nature of the exposed information.
Mitigation for this vulnerability requires immediate action by deploying the provided software updates across all affected devices. Apple has addressed these issues in iOS 26.7 and iPadOS 26.7 as well as newer major releases like iOS 27 and iPadOS 27, along with specific macOS versions including Sequoia 15.8, Golden Gate 27, and Tahoe 26. Administrators should ensure that device management policies enforce automatic updates or prompt users to install the latest patches promptly. Additionally, organizations should review app distribution channels to prevent sideloading of unverified applications that might attempt to exploit similar weaknesses in older versions. Users are advised to maintain strict control over application permissions and regularly audit which apps have access to sensitive data categories such as contacts, photos, and location services to minimize the attack surface even if future vulnerabilities arise.