CVE-2026-28876 Overview
CVE-2026-28876 is a directory path parsing vulnerability affecting multiple Apple operating systems that allows malicious applications to access sensitive user data. The flaw stems from improper path validation in the handling of directory paths, which was addressed by Apple with improved path validation mechanisms. This Improper Access Control vulnerability (CWE-284) enables unauthorized data exposure across Apple's ecosystem including iOS, iPadOS, macOS, and visionOS.
Critical Impact
A malicious app exploiting this vulnerability may be able to bypass access controls and access sensitive user data, potentially exposing personal information, credentials, or other protected content stored on affected devices.
Affected Products
- Apple iOS 18.7.7 and earlier, iOS 26.4 and earlier
- Apple iPadOS 18.7.7 and earlier, iPadOS 26.4 and earlier
- Apple macOS Sequoia 15.7.5 and earlier, macOS Sonoma 14.8.5 and earlier, macOS Tahoe 26.4 and earlier
- Apple visionOS 26.4 and earlier
Discovery Timeline
- 2026-03-25 - CVE-2026-28876 published to NVD
- 2026-03-25 - Last updated in NVD database
Technical Details for CVE-2026-28876
Vulnerability Analysis
This vulnerability is classified under CWE-284 (Improper Access Control), indicating a failure in the path validation logic within Apple's operating systems. The flaw resides in how directory paths are parsed and validated, allowing a locally installed application to traverse or manipulate path boundaries to access data that should be protected by the operating system's sandboxing and permission mechanisms.
The vulnerability requires local access through a malicious or compromised application, meaning an attacker would need to either distribute a malicious app or compromise an existing application on the target device. Once exploited, the application can read sensitive user data that would normally be restricted, potentially exposing photos, documents, credentials, or other private information stored on the device.
Root Cause
The root cause is a parsing issue in the directory path handling logic within Apple's file system access controls. The path validation mechanisms failed to properly sanitize or validate directory paths, allowing specially crafted path inputs to bypass access restrictions. This improper validation could enable path traversal attacks or symbolic link manipulation to access files outside the application's permitted sandbox boundaries.
Attack Vector
The attack requires a malicious application to be installed on the victim's device. The application can then exploit the path parsing flaw to construct directory paths that bypass the normal access control checks. Since the vulnerability is accessible over the network attack vector with no privileges required and no user interaction needed, an attacker with the ability to deploy a malicious app could potentially automate data exfiltration from affected devices.
The attack flow involves:
- Malicious app installation on the target device
- App constructs specially crafted directory path requests
- Path validation fails to properly sanitize the input
- App gains access to protected file system locations
- Sensitive user data is read and potentially exfiltrated
Detection Methods for CVE-2026-28876
Indicators of Compromise
- Unusual file system access patterns from applications attempting to read outside their sandbox
- Applications accessing directories or files they should not have permission to reach
- Unexpected data exfiltration activity from installed applications
- Log entries showing path traversal attempts or symbolic link manipulation
Detection Strategies
- Monitor for applications attempting to access sensitive directories such as /private/var/mobile/Library/ on iOS or ~/Library/ on macOS
- Implement endpoint detection rules to flag unusual file system enumeration behavior
- Review application entitlements and sandbox profiles for anomalies
- Deploy behavioral analysis to detect apps accessing data inconsistent with their stated purpose
Monitoring Recommendations
- Enable comprehensive file system auditing on macOS endpoints
- Utilize Mobile Device Management (MDM) solutions to monitor iOS/iPadOS device activity
- Review installed application lists for potentially malicious or unknown apps
- Monitor network traffic for unusual data exfiltration patterns from Apple devices
How to Mitigate CVE-2026-28876
Immediate Actions Required
- Update all affected Apple devices to the latest patched operating system versions immediately
- Review installed applications and remove any untrusted or unnecessary apps
- Enable automatic software updates to ensure timely patch deployment
- Restrict app installation to trusted sources (App Store) and consider MDM policies for enterprise environments
Patch Information
Apple has released security updates addressing this vulnerability across all affected platforms. Administrators and users should update to the following patched versions:
- iOS 18.7.7 and iPadOS 18.7.7 (for legacy branch)
- iOS 26.4 and iPadOS 26.4
- macOS Sequoia 15.7.5
- macOS Sonoma 14.8.5
- macOS Tahoe 26.4
- visionOS 26.4
For detailed patch information, refer to Apple's official security advisories:
- Apple Security Advisory #126792
- Apple Security Advisory #126793
- Apple Security Advisory #126794
- Apple Security Advisory #126795
- Apple Security Advisory #126796
- Apple Security Advisory #126799
Workarounds
- Restrict application installations to only verified and trusted applications from the App Store
- Implement Mobile Device Management (MDM) policies to control app installation and enforce security baselines
- Enable Screen Time or parental controls to limit app installation capabilities on personal devices
- Regularly audit installed applications and remove those that are unused or from unknown sources
# Check current macOS version and available updates
softwareupdate --list
# Install all available security updates on macOS
softwareupdate --install --all
# For iOS/iPadOS, navigate to Settings > General > Software Update
# Or use MDM to push updates to managed devices
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
