X-VPN macOS CVE-2026-2638 Local Privilege Escalation Vulnerability Advisory

Here is the summary of key vulnerability information from the webpage screenshot: --- Vulnerability Overview Vulnerability Name: Local Privilege Escalation Vulnerability CVE ID: CVE-2026-2638 Severity: CVSS v4.0 Score 7.3, High Vulnerability Type: Local Privilege Escalation Status: Fixed Exploitation Status: No in-the-wild exploitation observed --- Affected Scope Affected Versions: X-VPN macOS Web Version (installer package downloaded from the official website) versions 77.0 to 77.5 Unaffected Versions: - X-VPN Mac App Store version - Versions for Windows / iOS / Android / Linux / Router / TV / Chrome Extension / Chromebook / Game Consoles platforms --- Remediation Fixed Version: X-VPN macOS Web Version 77.5.1 and later User Action Recommendation: Immediately update to version 77.5.1 or later --- Vulnerability Principle Summary The vulnerability originates from the "Download Protection" feature in the X-VPN macOS Web Version. When scanning, quarantining, and restoring files, it relies solely on file paths to identify target files and does not re-validate file contents across different stages. Attackers can exploit this vulnerability given two conditions: 1. A malicious program running with standard user privileges exists on the device; 2. The malicious program replaces the original file during the time window between when "Download Protection" identifies the file and when it actually performs operations (e.g., via symbolic links or file renaming). Since "Download Protection" runs with administrative privileges, it inadvertently operates on the replaced file, thereby achieving privilege escalation. --- Key Fix Measures 1. File Identity Consistency Checks 2. Quarantine Integrity Validation 3. Symbolic Links Are Not Accepted in Critical Operations --- > Note: The page does not provide POC or exploit code snippets.

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X-VPN macOS CVE-2026-2638 Local Privilege Escalation Vulnerability Advisory