CVE-2026-84527 in iOS
Summary
by MITRE • 09/15/2026
A logging issue was addressed with improved data redaction. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, watchOS 27. An app may be able to access sensitive user data.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the operating system's logging mechanisms where sensitive user information is not adequately obscured before being written to log files or diagnostic outputs. This issue stems from insufficient input validation and sanitization processes within the application framework, specifically regarding how personal identifiable information (PII) and other confidential data are handled during routine operations such as error reporting, debugging sessions, or system diagnostics. The core technical flaw lies in the failure of the logging subsystem to apply proper redaction rules before persisting data, allowing applications with appropriate permissions to read these logs and extract sensitive content that was intended to remain private. This represents a classic case of improper access control combined with information exposure through insecure output handling, where the system fails to distinguish between public diagnostic data and protected user state.
From a technical perspective, this vulnerability aligns closely with CWE-532, which covers Information Exposure Through Log Files, as well as CWE-209 regarding the Generation of Error Message Containing Sensitive Information. The operational impact is significant because log files are often accessible to multiple processes and users within the same security context on iOS, iPadOS, macOS, tvOS, visionOS, and watchOS platforms. An attacker who gains access to a user's device or compromises an application with read permissions for system logs can extract credentials, session tokens, location data, contact information, or other personally identifiable details that were inadvertently logged by the operating system or third-party applications. This exposure undermines the confidentiality guarantees provided by the platform and violates privacy expectations established under regulations such as GDPR and CCPA, potentially leading to identity theft, unauthorized account access, or targeted social engineering attacks based on harvested personal data.
The affected versions include iOS 27, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, and watchOS 27. These updates indicate that the issue has been addressed through enhanced data redaction protocols within the logging infrastructure. The fix likely involves implementing stricter filtering rules for known sensitive data patterns, such as email addresses, phone numbers, IP addresses, and authentication tokens, ensuring they are masked or removed before being written to persistent storage. Additionally, the update may include improvements in permission checks to limit which processes can access detailed log entries, thereby reducing the attack surface for local privilege escalation or information disclosure attacks.
Mitigation strategies for this vulnerability primarily rely on applying the latest software updates provided by Apple across all supported platforms. For developers and system administrators, it is crucial to ensure that all devices are patched to at least iOS 27, iPadOS 27, macOS Sequoia 15.8, or their respective equivalent versions mentioned in the advisory. In environments where immediate patching is not feasible, organizations should implement strict access controls on log file directories and monitor for unusual read operations that could indicate exploitation attempts. Furthermore, application developers should review their own logging practices to ensure they are not inadvertently exposing sensitive data through custom log implementations, adhering to secure coding guidelines such as those outlined in the OWASP Top Ten under categories related to insecure direct object references or broken access control. Regular audits of system logs and implementation of automated scanning tools can help detect any residual exposure risks before they lead to significant security incidents.