CVE-2026-30971 in ZoneMinder
Summary
by MITRE • 10/16/2026
ZoneMinder is a free, open source closed-circuit television software application. Prior to 1.39.2, 1.38.2, and 1.36.40, ZoneMinder interpolates an unvalidated monitor Device field into shell commands in PHP and Perl control paths when an authenticated user with monitor-create or monitor-edit permission saves a Local monitor whose Device Path contains shell metacharacters and the monitor control or startup path runs. In this attack mechanism, the stored Device value reaches Perl qx() and backtick execution before zmdc.pl argument detainting, while separate PHP command paths use bypassable escapeshellcmd defenses. The attacker can execute arbitrary commands as the web server user. This vulnerability is fixed in 1.39.2, 1.38.2, and 1.36.40.
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Analysis
by VulDB Data Team • 10/16/2026
ZoneMinder serves as a widely deployed open-source closed-circuit television software application used for video surveillance management. A critical security flaw exists within versions prior to 1.39.2, 1.38.2, and 1.36.40 that allows authenticated users with specific permissions to execute arbitrary commands on the host system. The vulnerability stems from improper input validation in how the application handles monitor configuration data, specifically regarding the Device field associated with Local monitors. When an attacker possessing monitor-create or monitor-edit privileges saves a new or modified local monitor entry, they can inject shell metacharacters into the Device Path value. This unvalidated input is subsequently interpolated directly into shell commands executed by both PHP and Perl control paths within the application logic.
The technical mechanism of this exploitation involves multiple code pathways that fail to adequately sanitize user-supplied data before command execution. In the Perl-based components, the malicious Device value reaches internal functions such as qx() or backtick operators prior to any effective detainting process performed by zmdc.pl argument handling mechanisms. This timing allows shell metacharacters embedded in the input to be interpreted by the underlying operating system shell rather than being treated as literal string data. Simultaneously, separate command execution paths implemented in PHP utilize escapeshellcmd for defense; however, this function is bypassable under specific conditions related to how the arguments are constructed and passed through subsequent layers of processing. Consequently, an attacker can craft a Device Path that breaks out of intended argument boundaries and injects arbitrary system commands.
The operational impact of this vulnerability is severe, resulting in Remote Code Execution as the user context running the web server process. Since ZoneMinder typically runs with privileges associated with its web service account, successful exploitation grants the attacker significant control over the underlying operating environment. This can lead to full system compromise, including data exfiltration, installation of persistent backdoors, or lateral movement within the network infrastructure depending on the security posture and isolation measures in place for the server hosting ZoneMinder. The vulnerability is classified under CWE-78 Improper Neutralization of Special Elements used in an OS Command commonly known as OS Command Injection. From a tactical perspective, this aligns with MITRE ATT&CK techniques related to command and script interpretation, specifically those involving local execution via web application interfaces.
To mitigate this risk, administrators must upgrade ZoneMinder immediately to version 1.39.2 or later for the stable branch, or apply equivalent patches in versions 1.38.2 and 1.36.40 which contain fixes for these specific code paths. Until patching is complete, it is advisable to restrict access to the ZoneMinder web interface strictly to trusted IP addresses using network-level controls such as firewalls or VPNs. Additionally, implementing strict input validation at the application layer that rejects any non-alphanumeric characters in fields expected to contain only safe identifiers can provide a temporary defense-in-depth measure. Regular security audits and monitoring of system logs for unusual command execution patterns are also recommended to detect potential exploitation attempts early.