CVE-2026-82790 in PC-HELPER Wireless IO DIO-0404RY-LWF
Summary
by MITRE • 09/14/2026
Cross-site scripting vulnerability exists in PC-HELPER Wireless I/O DIO-0404RY-LWF and PC-HELPER Wireless I/O DIO-0404RY-LWF-US. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.
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Analysis
by VulDB Data Team • 09/14/2026
The identified security flaw represents a classic Cross-Site Scripting (XSS) vulnerability affecting the PC-HELPER Wireless I/O DIO-0404RY-LWF and its US variant, specifically within their embedded web management interfaces. This type of vulnerability typically arises when an application includes untrusted data in a new context without proper validation or escaping. In this specific case, the device fails to adequately sanitize user-supplied input before rendering it back to the client browser. When a malicious actor crafts a specially designed request containing executable JavaScript code and tricks a legitimate administrator into accessing that content through their web browser, the script is executed in the security context of the application's domain. This bypasses standard browser protections such as the same-origin policy, allowing the attacker to interact with the page as if they were an authenticated user.
From a technical perspective, this vulnerability aligns closely with CWE-79, which categorizes improper neutralization of input during web page generation. The operational impact is significant because it targets users who are already logged into the device's administrative interface. Once the arbitrary script executes, it can perform actions that mimic legitimate user interactions. This includes reading sensitive data displayed on the screen, such as configuration settings or network credentials stored in local storage or cookies. Furthermore, the attacker could modify page content dynamically to phish for additional credentials or redirect the victim to malicious external sites designed to exploit other vulnerabilities in their browser or operating system. In industrial control environments where these devices are often deployed, this compromise can lead to unauthorized changes in I/O configurations, potentially disrupting physical processes or creating backdoors for further network intrusion.
The risk is exacerbated by the nature of IoT and OT (Operational Technology) devices, which frequently lack robust input validation mechanisms due to resource constraints or legacy codebases. An attacker does not need direct access to the device's file system; instead, they rely on social engineering or cross-site request forgery techniques to trigger the execution context. If the session cookies are not marked with secure flags such as HttpOnly and Secure, the stolen session tokens can be exfiltrated via JavaScript, allowing persistent unauthorized access even after the initial XSS payload is removed from the page. This persistence transforms a transient script injection into a long-term compromise of the industrial network segment where the device resides.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary technical fix involves implementing strict output encoding for all dynamic content rendered in HTML, JavaScript, CSS, or URL contexts. Developers should utilize context-aware escaping libraries that automatically handle special characters based on their specific rendering environment. Additionally, deploying a Content Security Policy (CSP) header can significantly reduce the impact of XSS by restricting the sources from which scripts are allowed to load and execute. For administrators currently using these devices, it is critical to ensure that session cookies have appropriate security attributes enabled and to monitor for unusual administrative activity. Upgrading to patched firmware versions provided by PC-HELPER remains the most effective solution, as they will incorporate server-side input validation to reject or sanitize malicious payloads before they reach the client side.
This vulnerability maps directly to MITRE ATT&CK technique T1059, which covers Command and Scripting Interpreter execution via web browsers, specifically under sub-techniques related to browser-based attacks. It also relates to T1204, User Execution, as it relies on tricking a user into initiating the malicious action by visiting a crafted URL or link. Understanding these mappings helps in configuring intrusion detection systems to look for patterns associated with DOM manipulation and script injection attempts targeting industrial web interfaces. By treating this XSS flaw not just as an isolated bug but as part of a broader attack chain, organizations can better prioritize patching efforts and enhance their monitoring capabilities against similar threats affecting other connected devices within the network perimeter.