CVE-2026-5571: Technostrobe HI-LED Information Disclosure

CVE-2026-5571 Overview

A vulnerability has been identified in Technostrobe HI-LED-WR120-G2 version 5.5.0.1R6.03.30 affecting the Configuration Data Handler component. The vulnerability exists in an undisclosed function of the /fs file, where improper handling of the File argument leads to information disclosure. This flaw can be exploited remotely without authentication, potentially exposing sensitive configuration data to unauthorized parties.

Critical Impact

Remote attackers can exploit this information disclosure vulnerability to access sensitive configuration data from affected Technostrobe HI-LED-WR120-G2 devices without requiring authentication.

Affected Products

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

Discovery Timeline

• April 5, 2026 - CVE-2026-5571 published to NVD
• April 7, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5571

Vulnerability Analysis

This vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The flaw resides within the Configuration Data Handler component of the Technostrobe HI-LED-WR120-G2 industrial lighting controller. The affected function processes requests to the /fs endpoint, where insufficient access controls allow unauthorized users to retrieve sensitive configuration data by manipulating the File parameter.

The information disclosure weakness allows attackers to gain insights into the device's configuration, potentially revealing network settings, operational parameters, or other sensitive data that could facilitate further attacks against the infrastructure. The vendor was contacted about this vulnerability but did not respond to the disclosure notification.

Root Cause

The root cause of this vulnerability stems from inadequate input validation and access control mechanisms within the Configuration Data Handler. The /fs endpoint fails to properly authenticate requests or restrict access to sensitive file resources, allowing unauthenticated remote users to read configuration data by manipulating the File argument in HTTP requests.

Attack Vector

The vulnerability is exploitable remotely over the network. An attacker can craft HTTP requests to the /fs endpoint with manipulated File parameters to retrieve configuration data without requiring any authentication credentials. The exploit has been publicly disclosed, making it accessible to potential attackers.

The attack requires no user interaction and can be performed by any network-adjacent or internet-facing attacker who can reach the vulnerable device. Successful exploitation results in the disclosure of potentially sensitive configuration information.

Detection Methods for CVE-2026-5571

Indicators of Compromise

• Unusual HTTP requests targeting the /fs endpoint on Technostrobe HI-LED-WR120-G2 devices
• Unexpected file access attempts or configuration data retrieval from industrial lighting controllers
• Network traffic patterns showing repeated requests with varied File parameter values
• Access log entries from unauthenticated sources attempting to read configuration files

Detection Strategies

• Monitor HTTP access logs for requests to the /fs endpoint, particularly from unauthorized IP addresses
• Implement network intrusion detection rules to alert on suspicious traffic patterns targeting industrial control devices
• Deploy web application firewall rules to detect and block path traversal or file disclosure attempts
• Review authentication logs for failed or anomalous access attempts to device configuration interfaces

Monitoring Recommendations

• Enable detailed logging on all Technostrobe HI-LED-WR120-G2 devices and forward logs to a centralized SIEM
• Configure alerts for any access attempts to the /fs endpoint from non-whitelisted IP addresses
• Implement network segmentation monitoring to detect lateral movement from compromised devices
• Establish baseline network behavior for industrial lighting controllers and alert on deviations

How to Mitigate CVE-2026-5571

Immediate Actions Required

• Isolate affected Technostrobe HI-LED-WR120-G2 devices from untrusted networks immediately
• Implement network segmentation to restrict access to only authorized management systems
• Deploy firewall rules to block external access to the /fs endpoint
• Audit device configurations for any signs of unauthorized access or data exfiltration

Patch Information

At the time of publication, the vendor (Technostrobe) has not responded to disclosure attempts or released an official patch for this vulnerability. Organizations should monitor vendor communications and security advisories for future updates. Additional technical details and vulnerability research are available through the GitHub CVE Info Disclosure research page and VulDB vulnerability entry.

Workarounds

• Place vulnerable devices behind a VPN or jump host requiring authentication
• Implement strict firewall rules limiting access to device management interfaces to trusted IP addresses only
• Consider disabling or restricting the /fs endpoint if not required for normal operations
• Deploy a reverse proxy with authentication in front of vulnerable devices to add an access control layer

# Example firewall rule to restrict access to affected devices
# Allow only management network access to Technostrobe devices
iptables -A INPUT -s 10.10.10.0/24 -d <device_ip> -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -s 10.10.10.0/24 -d <device_ip> -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -d <device_ip> -p tcp --dport 80 -j DROP
iptables -A INPUT -d <device_ip> -p tcp --dport 443 -j DROP