CVE-2026-86890 in iOS
Summary
by MITRE • 09/15/2026
A logic issue was addressed with improved checks. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27. An attacker with physical access to a locked device may be able to view sensitive user information.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes a logic flaw within the operating system's authentication or data protection mechanisms, specifically affecting iOS and iPadOS versions prior to 26.7 and 27. This issue arises from insufficient validation checks during the process of accessing protected user data when the device is in a locked state. While modern mobile operating systems employ robust encryption for data at rest, relying on keys derived from the user's passcode or biometric credentials, this specific logic error allows an attacker with physical access to bypass these protections under certain conditions. The core technical flaw lies not necessarily in weak cryptography but in the application layer's failure to enforce strict state transitions and permission checks before rendering sensitive information for display or transmission.
From a security architecture perspective, this vulnerability aligns closely with CWE-20 Improper Input Validation and potentially CWE-862 Missing Authorization. The system fails to correctly verify that the requesting process has the necessary privileges to access specific data segments while the device is locked. In typical secure implementations, even if an attacker gains temporary control over a UI element or background service due to a race condition or logic error, the underlying framework should deny any attempt to read protected containers unless the user has successfully authenticated. The absence of these rigorous checks creates a pathway for unauthorized data exfiltration without requiring complex exploitation techniques like buffer overflows or kernel exploits.
The operational impact of this vulnerability is significant because it undermines the fundamental trust model of mobile devices, which assume that physical possession does not equate to immediate access if the device remains locked. An attacker with physical access could potentially view sensitive user information such as messages, emails, contacts, or cached authentication tokens without needing the passcode. This exposure can lead to severe privacy violations and may serve as a stepping stone for further attacks, including account takeover via session hijacking if active sessions are exposed. The risk is particularly acute in scenarios where devices are left unattended in public spaces or stolen from users who have not recently re-authenticated.
This type of vulnerability maps directly to the ATT&CK technique T1539 Steal Web Session Cookie, as well as general data exfiltration tactics under Initial Access and Collection phases if leveraged for broader compromise. It also relates to lateral movement considerations where exposed credentials or tokens could be used to access cloud services associated with the device. The mitigation strategy primarily involves updating the operating system to versions 26.7 or later, which include improved checks designed to enforce stricter separation between locked-state operations and sensitive data retrieval. Users should ensure their devices are updated promptly upon release of these patches. Additionally, enabling strong passcodes and utilizing features like erase data after multiple failed attempts can provide additional layers of defense against physical access attacks until the software is fully patched.