CVE-2026-20660
📋 TL;DR
This CVE describes a path handling vulnerability (CWE-22) in multiple Apple operating systems and Safari that allows a remote attacker to write arbitrary files to affected systems. The vulnerability affects macOS, iOS, iPadOS, visionOS, and Safari users running outdated versions. Successful exploitation could lead to system compromise or data manipulation.
💻 Affected Systems
- macOS
- iOS
- iPadOS
- visionOS
- Safari
📦 What is this software?
Ipados by Apple
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Safari by Apple
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains arbitrary file write capability leading to system compromise, data destruction, or malware installation with system-level privileges.
Likely Case
Remote attacker writes malicious files to user-accessible locations, potentially leading to privilege escalation, data exfiltration, or persistence mechanisms.
If Mitigated
With proper network segmentation and least privilege controls, impact limited to isolated systems with minimal critical data exposure.
🎯 Exploit Status
Remote exploitation possible without authentication; path traversal/file write vulnerabilities typically require some attacker interaction or specific conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Tahoe 26.3, macOS Sonoma 14.8.4, iOS 18.7.5, iPadOS 18.7.5, visionOS 26.3, iOS 26.3, iPadOS 26.3, Safari 26.3
Vendor Advisory: https://support.apple.com/en-us/126346
Restart Required: Yes
Instructions:
1. Open System Settings > General > Software Update. 2. Install available updates for your operating system. 3. For Safari, update through App Store or system updates. 4. Restart device after installation.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to affected systems, especially from untrusted networks.
Application Whitelisting
macOSImplement application control to prevent execution of unauthorized files.
🧯 If You Can't Patch
- Isolate affected systems from internet and untrusted networks
- Implement strict file system monitoring and integrity checking
🔍 How to Verify
Check if Vulnerable:
Check system version: macOS - About This Mac; iOS/iPadOS - Settings > General > About; Safari - Safari > About SafariCheck Version:
macOS: sw_vers -productVersion; iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify installed version matches or exceeds patched versions listed in fix_official.patch_version📡 Detection & Monitoring
Log Indicators:
- Unexpected file write operations in system logs
- Suspicious path traversal patterns in web server logs
Network Indicators:
- Unusual outbound connections following file write attempts
- HTTP requests with path traversal patterns
SIEM Query:
source="*system.log*" AND ("file write" OR "path traversal") OR source="*web.log*" AND ("../" OR "..\" OR "%2e%2e")