CVE-2026-32843 in Location Aware Sensor System
Summary
by MITRE • 03/19/2026
Location Aware Sensor System by Linkit ONE, up to commit f06bd20 (2023-04-26), contains a reflected cross-site scripting vulnerability in the PM25.php file that allows remote attackers to execute arbitrary JavaScript by injecting malicious code into GET parameters. Attackers can craft a malicious URL containing unencoded payloads in the site, city, district, channel, or apikey parameters to execute scripts in victims' browsers when they visit the page.
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Analysis
by VulDB Data Team • 03/24/2026
The Location Aware Sensor System developed by Linkit ONE represents a networked environmental monitoring solution that collects and displays air quality data through web interfaces. This system operates by aggregating sensor information and presenting it via web pages that utilize PHP scripting to process user inputs and display dynamic content. The vulnerability exists within the PM25.php file which serves as a critical interface for accessing air quality measurements from various locations. The system's architecture relies on processing user-provided parameters through GET requests to retrieve and display specific environmental data points, creating an attack surface that exposes the application to client-side exploitation techniques.
The reflected cross-site scripting vulnerability stems from insufficient input validation and output encoding within the PM25.php file implementation. When users provide parameters such as site, city, district, channel, or apikey through URL query strings, the application fails to properly sanitize these inputs before incorporating them into HTML responses. This occurs because the system directly echoes user-supplied values without adequate encoding or filtering mechanisms, allowing malicious payloads to be injected and subsequently executed within the victim's browser context. The vulnerability specifically affects the commit version f06bd20 released on April 26, 2023, indicating this weakness was introduced in a recent codebase update and represents a regression or oversight in security implementation.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform sophisticated client-side attacks that can compromise user sessions and exfiltrate sensitive information. When victims click on maliciously crafted URLs containing encoded JavaScript payloads, the reflected scripts execute within their browser environment, potentially stealing cookies, session tokens, or other sensitive data. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and represents a classic example of how improper input handling can create persistent security weaknesses. The attack vector requires minimal user interaction beyond visiting the malicious page, making it particularly dangerous for widespread exploitation within the system's user base.
Security mitigations for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the PM25.php file and related web components. The most effective approach involves sanitizing all user-provided parameters through proper HTML encoding before incorporating them into dynamic web content, ensuring that any potentially malicious payloads are neutralized. Additionally, implementing Content Security Policy headers can provide an additional layer of protection by restricting script execution within the application context. The system should also enforce strict parameter validation to reject any inputs containing known malicious patterns or character sequences that could be used to construct cross-site scripting attacks. Organizations should conduct regular security assessments of their web applications and maintain updated vulnerability management processes to prevent similar issues from emerging in future releases, as this vulnerability represents a fundamental weakness in the application's defensive mechanisms against client-side exploitation techniques.