CVE-2026-5574: Technostrobe HI-LED Auth Bypass Vulnerability

CVE-2026-5574 Overview

A missing authorization vulnerability has been identified in Technostrobe HI-LED-WR120-G2 version 5.5.0.1R6.03.30. The vulnerability affects the deletefile function within the FsBrowseClean component, where improper handling of the dir/path argument allows unauthorized file deletion operations. This flaw enables remote attackers to manipulate file system resources without proper authorization checks, potentially leading to data loss or system instability.

Critical Impact

Remote attackers can exploit this missing authorization vulnerability to delete files on affected Technostrobe HI-LED-WR120-G2 devices without authentication, potentially causing service disruption or data loss. The exploit has been publicly disclosed and the vendor has not responded to disclosure attempts.

Affected Products

• Technostrobe HI-LED-WR120-G2 version 5.5.0.1R6.03.30

Discovery Timeline

• April 5, 2026 - CVE-2026-5574 published to NVD
• April 7, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5574

Vulnerability Analysis

This vulnerability represents a classic case of Missing Authorization (CWE-862), where the FsBrowseClean component fails to implement proper access control checks before executing file deletion operations. The deletefile function accepts user-supplied input through the dir/path argument without validating whether the requesting user has the necessary permissions to perform the operation.

The network-accessible nature of this vulnerability means that any remote attacker who can reach the device's web interface can potentially exploit this flaw. The lack of authentication or authorization verification allows unauthorized users to invoke the deletefile function and delete arbitrary files within the accessible file system scope.

The exploit has been publicly disclosed, which significantly increases the risk of active exploitation in the wild. The vendor was contacted about this vulnerability but did not respond, leaving affected devices without an official remediation path.

Root Cause

The root cause of this vulnerability lies in the FsBrowseClean component's failure to implement proper authorization controls. The deletefile function processes the dir/path argument and executes file deletion operations without verifying:

1. Whether the requesting user is authenticated
2. Whether the authenticated user has permission to delete the specified files
3. Whether the target path is within an allowed scope

This design flaw allows any network-accessible user to invoke file deletion functionality that should be restricted to authorized administrators only.

Attack Vector

The attack can be initiated remotely over the network. An attacker can send crafted HTTP requests to the FsBrowseClean component, manipulating the dir/path argument to target specific files or directories for deletion.

The vulnerability allows for unauthorized modification of file system contents, potentially enabling attackers to:

• Delete critical configuration files, causing device malfunction
• Remove log files to cover tracks of malicious activity
• Disrupt normal device operation by removing essential system files

Technical details and proof-of-concept information are available in the GitHub CVE Vulnerability Research repository.

Detection Methods for CVE-2026-5574

Indicators of Compromise

• Unexpected file deletions or missing configuration files on Technostrobe HI-LED-WR120-G2 devices
• HTTP requests to the FsBrowseClean component containing suspicious dir or path parameters
• Web server access logs showing unauthenticated requests to file management endpoints
• Device malfunction or configuration reset due to deleted system files

Detection Strategies

• Monitor HTTP traffic to Technostrobe HI-LED-WR120-G2 devices for requests containing deletefile operations with suspicious path parameters
• Implement network intrusion detection rules to alert on requests to the FsBrowseClean component from unauthorized sources
• Deploy file integrity monitoring on critical device configurations to detect unauthorized deletions
• Review web server logs for patterns of file deletion requests from unexpected IP addresses

Monitoring Recommendations

• Establish baseline file system state and monitor for unexpected changes on affected devices
• Configure alerts for any access to the FsBrowseClean component from external networks
• Implement network segmentation to limit exposure of vulnerable devices to untrusted networks
• Log all administrative actions and file operations for forensic analysis

How to Mitigate CVE-2026-5574

Immediate Actions Required

• Restrict network access to Technostrobe HI-LED-WR120-G2 devices using firewall rules or network segmentation
• Place affected devices behind a VPN or authenticated reverse proxy to limit exposure
• Disable or restrict access to the FsBrowseClean component if not required for operations
• Monitor affected devices for signs of unauthorized file deletion activity

Patch Information

No official patch is currently available from the vendor. The vendor was contacted regarding this vulnerability but did not respond. Organizations should implement network-level mitigations until a patch becomes available.

For additional technical details, refer to VulDB Vulnerability #355344 and the VulDB Submission #783327.

Workarounds

• Implement network access control lists (ACLs) to restrict access to the device's web interface to trusted IP addresses only
• Deploy a web application firewall (WAF) to filter requests containing suspicious dir or path parameters
• Disable remote management features and use local console access when administration is required
• Consider replacing affected devices with alternatives that have proper authorization controls

# Example firewall rule to restrict access to device web interface
# Replace 192.168.1.100 with the device IP and 10.0.0.0/24 with trusted admin network
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -j DROP
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 443 -j DROP