CVE-2026-84525 in macOS
Summary
by MITRE • 09/15/2026
A logging issue was addressed with improved data redaction. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to access user-sensitive data.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described involves a flaw in the logging mechanisms of Apple's operating systems, specifically affecting versions prior to macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. The core technical issue stems from insufficient data redaction within system logs. In many modern applications and system services, sensitive user information such as personally identifiable information (PII), authentication tokens, or session identifiers is inadvertently written to log files during normal operation. While logging is essential for debugging and monitoring system health, the failure to properly sanitize these entries before they are persisted creates a significant security gap. This flaw allows any application with access to read these logs to extract data that was intended to remain confidential, thereby bypassing standard privacy controls designed to protect user information from unauthorized exposure.
From an operational perspective, this vulnerability enables local privilege escalation or information disclosure depending on the context in which the logging occurs. If a malicious app can trigger specific actions within another application or system service, it may be able to read the resulting log entries that contain sensitive data. This could lead to the compromise of user accounts through credential theft, session hijacking if authentication tokens are logged, or broader privacy violations where personal details like names, addresses, or financial information are exposed. The impact is particularly severe in multi-user environments or on devices used for business purposes, where the exposure of such data can lead to regulatory non-compliance and significant reputational damage. Attackers do not necessarily need high-level privileges if they can exploit lower-privileged applications that have access to shared log directories or system-wide logging services.
This issue aligns with CWE-532, which is classified as Information Exposure Through Log Files. It also relates to the ATT&CK technique T1005, Data from Local System, where adversaries collect data stored on local systems for later exfiltration. The failure to redact sensitive information represents a common oversight in software development lifecycle processes, often resulting from inadequate security testing of logging implementations or reliance on default configurations that prioritize verbosity over privacy. Developers must ensure that all log statements are reviewed and sanitized before deployment, utilizing established frameworks for secure coding practices that mandate the removal or masking of high-risk data fields such as passwords, keys, and personal identifiers.
To mitigate this vulnerability, users should immediately update their systems to macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7, where Apple has implemented improved data redaction mechanisms in the logging subsystems. These updates ensure that sensitive information is either omitted from logs entirely or masked using irreversible techniques such as hashing or truncation before being written to disk. For developers and system administrators, it is critical to audit existing applications for similar logging flaws and implement strict input validation and output encoding strategies. Regular security assessments should include checks for improper data handling in log files to prevent future occurrences of this class of vulnerability.