CVE-2026-30282: Cast to TV Screen Mirroring RCE Flaw

CVE-2026-30282 Overview

CVE-2026-30282 is an arbitrary file overwrite vulnerability affecting UXGROUP LLC Cast to TV Screen Mirroring v2.2.77. This path traversal flaw (CWE-22) enables attackers to overwrite critical internal files via the application's file import process. Successful exploitation can result in arbitrary code execution or information exposure, presenting a significant risk to devices running the vulnerable application.

Critical Impact

Attackers can leverage the file import functionality to overwrite critical system files, potentially achieving arbitrary code execution or exposing sensitive information on affected devices.

Affected Products

• UXGROUP LLC Cast to TV Screen Mirroring v2.2.77

Discovery Timeline

• 2026-03-31 - CVE-2026-30282 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-30282

Vulnerability Analysis

This vulnerability stems from improper path validation during the file import process within the Cast to TV Screen Mirroring application. When users import files through the application interface, the software fails to properly sanitize file paths, allowing attackers to craft malicious input containing path traversal sequences. This enables writing to arbitrary locations outside the intended directory structure.

The vulnerability requires an authenticated user (low privileges) and some user interaction to exploit. However, the impact extends beyond the vulnerable component itself, potentially affecting other resources on the system. If successfully exploited, the attacker can achieve complete compromise of confidentiality, integrity, and availability of the targeted system.

Root Cause

The root cause is a classic path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory). The file import functionality does not properly validate or sanitize user-supplied file paths before using them in file system operations. This allows attackers to use directory traversal sequences (such as ../) to escape the intended directory and write files to arbitrary locations on the file system.

Attack Vector

The attack is network-based and requires an attacker to craft malicious input targeting the file import functionality. The attacker submits a specially crafted filename or path containing traversal sequences during the import process. Due to the lack of proper input validation, these sequences are processed literally, allowing the attacker to specify file destinations outside the application's intended scope.

When the malicious file path is processed, the application writes content to the attacker-specified location, potentially overwriting critical application files, configuration files, or system files. This can lead to arbitrary code execution if executable files or configuration files that control application behavior are overwritten.

Detection Methods for CVE-2026-30282

Indicators of Compromise

• Unexpected file modifications in system directories or application installation paths
• Presence of path traversal sequences (../, ..\\) in application logs related to file import operations
• Unauthorized changes to application configuration or executable files
• Unusual file system activity associated with the Cast to TV Screen Mirroring application process

Detection Strategies

• Monitor file system operations performed by the Cast to TV Screen Mirroring application for writes outside expected directories
• Implement application-level logging to capture file import requests and inspect for traversal patterns
• Deploy endpoint detection rules to alert on path traversal attempts in file operations
• Use file integrity monitoring to detect unauthorized modifications to critical system and application files

Monitoring Recommendations

• Enable verbose logging for the Cast to TV Screen Mirroring application to capture file import activities
• Configure security monitoring tools to flag any file path containing ../ or similar traversal patterns
• Monitor for process behavior anomalies, particularly file writes to unexpected locations
• Review application logs periodically for signs of exploitation attempts

How to Mitigate CVE-2026-30282

Immediate Actions Required

• Restrict or disable the file import functionality in Cast to TV Screen Mirroring until a patch is available
• Review system and application files for unauthorized modifications
• Limit network exposure of devices running the vulnerable application
• Consider uninstalling the application if it is not essential to operations

Patch Information

No official patch information is currently available from the vendor. Monitor vendor communications and official channels for security updates. Additional technical details about this vulnerability can be found in the GitHub Issue #27 from the SecSys Fudan University security research team.

Workarounds

• Disable or restrict access to the file import feature within the application
• Implement network segmentation to isolate devices running the vulnerable application
• Use application control policies to restrict the Cast to TV Screen Mirroring application's file system access
• Monitor and alert on file system operations performed by the application to detect potential exploitation attempts

# Example: Restrict application file system access (Android device)
# Use ADB to revoke storage permissions if applicable
adb shell pm revoke com.uxgroup.casttotv android.permission.WRITE_EXTERNAL_STORAGE
adb shell pm revoke com.uxgroup.casttotv android.permission.READ_EXTERNAL_STORAGE