CVE-2026-82775 in M2M Gateway
Summary
by MITRE • 09/14/2026
An exposure of information through directory listing issue exists in CONPROSYS M2M Gateway Series and CONPROSYS M2M Controller Series. Accessing a specific URL on this product may allow a remote unauthenticated attacker to obtain the directory list without authentication.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified within the CONPROSYS M2M Gateway and Controller series represents a critical information disclosure flaw rooted in improper configuration of web server resources, specifically manifesting as an insecure direct object reference or misconfigured directory indexing. This issue allows remote unauthenticated attackers to enumerate files and directories on the affected devices by accessing specific URLs that lack proper access controls or authentication mechanisms. In industrial control systems and IoT environments, such gateways often serve as critical interfaces for monitoring and managing connected assets, making the exposure of their internal file structures particularly dangerous. The absence of authentication requirements means that any entity with network connectivity to the device can exploit this misconfiguration without needing valid credentials, significantly lowering the barrier to entry for potential adversaries.
From a technical perspective, this vulnerability aligns closely with CWE-548, which describes Information Exposure Through Directory Listing, and is often associated with CWE-200, where an attacker gains access to sensitive information that could aid in further attacks. The root cause typically lies in the web server software running on the embedded device being configured to automatically generate directory listings when a requested path does not point to a specific file or index page. This behavior exposes metadata such as filenames, potentially revealing backup files, configuration scripts, database dumps, or other sensitive artifacts that were inadvertently left accessible by developers or system administrators during deployment or maintenance phases.
The operational impact of this vulnerability extends beyond simple data leakage. By obtaining the directory listing, an attacker can map out the internal structure of the device's file system, identifying paths to critical configuration files, firmware images, or administrative interfaces. This reconnaissance phase is a precursor to more severe attacks such as privilege escalation, remote code execution, or denial of service. In the context of industrial IoT, where these devices manage machine-to-machine communication and process automation, compromising the integrity of this information can lead to unauthorized control over physical processes, disruption of production lines, or theft of proprietary operational data. The lack of authentication exacerbates the risk, as it allows for automated scanning tools to rapidly identify vulnerable instances across a network segment.
To mitigate this vulnerability, immediate remediation steps should focus on hardening the web server configuration hosted by the CONPROSYS devices. Administrators must ensure that directory listing is explicitly disabled through server directives such as Options -Indexes in Apache or autoindex off in Nginx configurations if applicable to the embedded environment. Additionally, implementing strict access controls and requiring authentication for all administrative interfaces and sensitive directories is essential. Regular security audits should be conducted to verify that no unnecessary files are exposed via web services. If possible, updating the device firmware to a version provided by CONPROSYS that addresses this misconfiguration is recommended. Network-level segmentation can also help limit exposure by restricting access to these devices only from trusted management networks, thereby reducing the attack surface available to remote unauthenticated actors.