CVE-2026-82777 in Integrated Type CPS-PC341-*-9201
Summary
by MITRE • 09/14/2026
Improper neutralization of special elements used in an OS command ('OS Command Injection') issue exists in CONPROSYS PAC Series. If this vulnerability is exploited, an arbitrary OS command may be executed by an attacker who can log in to the product.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified as Improper Neutralization of Special Elements Used in an Operating System Command represents a critical security flaw within the CONPROSYS PAC Series programmable automation controller platform. This specific issue falls under the category of OS Command Injection, which is formally classified by the Common Weakness Enumeration (CWE) standard as CWE-78. The core technical deficiency lies in the application's failure to adequately sanitize or validate user-supplied input before it is incorporated into system-level commands. When an attacker interacts with vulnerable endpoints within the CONPROSYS PAC Series interface, they can inject malicious shell metacharacters such as semicolons, pipes, or ampersands. These characters allow the injection of additional commands that are executed by the underlying operating system with the privileges associated with the application process. This lack of input validation creates a direct pathway for code execution outside the intended scope of the software's functionality.
The operational impact of this vulnerability is severe due to its potential for arbitrary command execution. Once an attacker successfully exploits this flaw, they gain the ability to run any operating system command on the host machine running the CONPROSYS PAC Series software. This capability effectively results in a complete compromise of the affected system. An adversary could use this access to install backdoors, exfiltrate sensitive industrial control data, modify configuration files that dictate automation logic, or pivot further into the connected network infrastructure. In an industrial environment where PLCs and PACs are central to operational technology (OT) processes, such a breach can lead to significant physical consequences, including production halts, equipment damage, or safety hazards if critical machinery is manipulated through injected commands.
From a threat actor perspective, this vulnerability aligns with the ATT&CK technique T1059 Command and Scripting Interpreter, specifically sub-techniques involving shell access like T1059.004. The attack vector requires an authenticated user, meaning the attacker must first bypass authentication mechanisms or possess valid credentials to reach the vulnerable component. However, once inside, the privilege escalation from a standard application context to arbitrary OS command execution is immediate and unmitigated by input filtering controls. This makes it particularly dangerous in scenarios where internal network segmentation has been compromised or when insider threats are present.
Mitigation strategies must focus on both technical remediation and operational hardening. The primary fix involves updating the CONPROSYS PAC Series software to a version provided by the vendor that includes proper input validation and output encoding mechanisms. Developers should implement strict allow-listing for all user inputs, ensuring that only expected characters are processed while rejecting or escaping any special shell metacharacters. Additionally, employing parameterized commands instead of string concatenation when invoking system processes can prevent injection attacks. From an operational standpoint, organizations should enforce the principle of least privilege by running application services under restricted accounts with minimal OS-level permissions. Network segmentation is also critical to isolate PAC systems from general IT networks and restrict access to only authorized management stations. Regular vulnerability assessments and penetration testing focused on input validation flaws are recommended to identify similar weaknesses across the industrial control system environment before they can be exploited.