CVE-2026-84541 Overview
CVE-2026-84541 is an input validation vulnerability affecting multiple versions of Apple macOS. The flaw allows a local application to access restricted files that should be protected by macOS security controls. Apple addressed the issue by adding improved input validation in macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. The weakness is categorized under [CWE-22] (Improper Limitation of a Pathname to a Restricted Directory), commonly known as path traversal.
Critical Impact
A malicious or compromised local application can bypass file access restrictions and read protected files on affected macOS systems, exposing sensitive user or system data.
Affected Products
- Apple macOS prior to Golden Gate 27
- Apple macOS Sequoia prior to 15.8
- Apple macOS Tahoe prior to 26.7
Discovery Timeline
- 2026-09-14 - CVE-2026-84541 published to the National Vulnerability Database (NVD)
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-84541
Vulnerability Analysis
The vulnerability stems from insufficient input validation in a macOS component that handles file path inputs from applications. Apple's advisory states the issue was addressed with improved input validation. An application running locally can supply crafted input that causes the underlying system routine to resolve or access files outside the caller's permitted scope.
The outcome is an information disclosure condition affecting confidentiality. Successful exploitation exposes the contents of restricted files but does not modify data or disrupt availability. Exploitation requires local code execution on the target Mac and some form of user interaction, according to the CVSS vector.
Root Cause
The root cause is improper validation of pathname inputs, tracked as [CWE-22]. When user-controlled input is used to construct or resolve file paths without adequate normalization and boundary checks, an attacker can reference files outside the intended directory. Apple has not published a component-level technical breakdown of the affected subsystem in the referenced advisories.
Attack Vector
An attacker must first place or run an application on the target system. That application then invokes the vulnerable interface with crafted path input to reach files that macOS access controls would normally restrict. Because user interaction is required, plausible delivery scenarios include trojanized applications, malicious installers, or software delivered through social engineering.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.168%.
Apple has not released code-level exploitation details. See the Apple Support Document 149035, Apple Support Document 149042, and Apple Support Document 149043 for vendor-published information.
Detection Methods for CVE-2026-84541
Indicators of Compromise
- Unexpected read access to system-protected paths such as files under /Library, /private/var, or other locations normally guarded by macOS access controls.
- Applications performing repeated file open operations that reference paths containing traversal sequences such as ../ or symbolic-link redirections.
- Newly installed or unsigned applications making file system calls that deviate from their documented functionality.
Detection Strategies
- Monitor endpoint telemetry for process-file access events where a non-privileged application reads files outside its sandbox container or Transparency, Consent, and Control (TCC) scope.
- Correlate file access anomalies with process provenance to identify applications that were recently downloaded, installed, or launched by the user.
- Alert on file access patterns that suggest path traversal, including canonicalization mismatches between requested and resolved paths.
Monitoring Recommendations
- Ingest macOS Endpoint Security framework events into a central analytics platform and retain file open, rename, and symlink events for review.
- Track macOS build and version data across the fleet to identify hosts still running versions earlier than macOS Sequoia 15.8, macOS Tahoe 26.7, or macOS Golden Gate 27.
- Baseline expected file access behavior per application and flag deviations that touch protected directories.
How to Mitigate CVE-2026-84541
Immediate Actions Required
- Apply Apple's security updates to bring macOS to Golden Gate 27, Sequoia 15.8, or Tahoe 26.7 as appropriate for the host.
- Inventory macOS endpoints and prioritize patching for systems that handle sensitive data or run untrusted third-party applications.
- Restrict installation of unsigned or unnotarized applications through Gatekeeper policy and mobile device management (MDM) controls.
Patch Information
Apple fixed CVE-2026-84541 by improving input validation in the affected component. Patched releases are macOS Golden Gate 27, macOS Sequoia 15.8, and macOS Tahoe 26.7. Refer to Apple Support Document 149035, Apple Support Document 149042, and Apple Support Document 149043 for release-specific details.
Workarounds
- No vendor-provided workaround exists; Apple recommends installing the security update.
- Reduce exposure by limiting user privileges and blocking installation of untrusted applications through MDM configuration profiles.
- Enforce Full Disk Access and TCC prompts as gating controls so unfamiliar applications cannot silently expand their file access footprint.
# Verify the installed macOS version and confirm it meets the patched baseline
sw_vers -productVersion
# Trigger a software update check and install available security updates
sudo softwareupdate --list
sudo softwareupdate --install --all --restart
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
