CVE-2026-52102: OpenMediaVault OS Command Injection RCE

CVE-2026-52102 Overview

CVE-2026-52102 is an operating system (OS) command injection vulnerability in the openmediavault-md plugin shipped with OpenMediaVault v8.0.4-1. The plugin fails to sanitize shell metacharacters passed through user-controllable input, allowing authenticated attackers to inject arbitrary shell commands. Because the OpenMediaVault backend executes plugin operations with elevated privileges, injected commands run as root. OpenMediaVault is a Debian-based network-attached storage (NAS) solution frequently deployed on home labs and small business file servers, making exposed instances a viable target for lateral movement and data theft.

Critical Impact
Successful exploitation yields arbitrary command execution as root on the underlying NAS host, enabling full system compromise, data exfiltration, and persistence.

Affected Products

OpenMediaVault v8.0.4-1
openmediavault-md plugin (software RAID management module)
Debian-based NAS deployments running the affected plugin version

Discovery Timeline

2026-08-03 - CVE-2026-52102 published to the National Vulnerability Database (NVD)
2026-08-03 - Last updated in NVD database

Technical Details for CVE-2026-52102

Vulnerability Analysis

The openmediavault-md plugin provides a web interface for managing Linux software RAID arrays through mdadm. Backend RPC methods accept parameters such as device paths, array names, and RAID levels, then construct shell command strings that are executed by the OpenMediaVault engine. When the plugin concatenates unsanitized user input into these command strings, shell metacharacters including ;, |, &&, and backticks retain their special meaning. An authenticated attacker with access to the RAID management functionality can supply crafted parameter values that break out of the intended mdadm invocation and execute additional commands in the same shell context.

Because the OpenMediaVault backend runs plugin actions through its privileged engine daemon, injected commands inherit root privileges. This grants attackers unrestricted access to the file system, network configuration, and stored data.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-78]. Input handling in the affected RPC methods relies on string concatenation rather than argument arrays or explicit allowlists, so any metacharacter supplied by the caller is passed directly to the shell.

Attack Vector

Exploitation requires authenticated access to the OpenMediaVault web administration interface where the openmediavault-md plugin is exposed. The attacker submits a RAID-related request containing shell metacharacters embedded in a parameter such as a device name or array label. The backend interpolates the payload into a shell command and executes it as root. A proof-of-concept demonstrating the injection is available in the public GitHub Gist PoC. Refer to the OpenMediaVault repository for the plugin source that constructs the vulnerable commands.

Detection Methods for CVE-2026-52102

Indicators of Compromise

Unexpected child processes spawned by the OpenMediaVault engine daemon (omv-engined), especially shells such as /bin/sh -c invoking commands unrelated to mdadm.
Outbound network connections from the NAS host to unfamiliar destinations shortly after RAID management requests.
New or modified files in /root, /etc/cron.d/, or /usr/local/bin/ timestamped near suspicious plugin activity.
Web server access log entries containing shell metacharacters (;, |, `, $() inside RAID-related RPC parameters.

Detection Strategies

Monitor process ancestry on NAS hosts to alert when omv-engined or the PHP-FPM worker spawns interactive shells or non-RAID binaries.
Inspect OpenMediaVault RPC request bodies for shell metacharacters in fields associated with the md service methods.
Correlate authentication events with subsequent process creation to identify authenticated sessions that trigger command execution anomalies.

Monitoring Recommendations

Forward /var/log/openmediavault-engined.log, auth.log, and web server access logs to a centralized analytics platform for rule-based alerting.
Enable Linux auditd rules on execve calls with parent processes belonging to the OpenMediaVault stack.
Track EPSS trends for CVE-2026-52102, currently at 0.617% (46.2 percentile), and re-evaluate exposure as public exploitation increases.

How to Mitigate CVE-2026-52102

Immediate Actions Required

Restrict access to the OpenMediaVault web interface to trusted management networks or a VPN, blocking direct exposure to the internet.
Disable the openmediavault-md plugin on hosts where software RAID management is not required.
Rotate administrative credentials and audit user accounts that have permission to invoke RAID management functions.

Patch Information

No fixed version is referenced in the NVD entry at the time of publication. Track the OpenMediaVault project repository and the OpenMediaVault official site for updated plugin releases addressing CVE-2026-52102, and apply them as soon as they are published.

Workarounds

Remove or mask the openmediavault-md plugin package with apt-get remove openmediavault-md until an official fix is released.
Enforce network segmentation so the NAS management interface is reachable only from a dedicated administrative subnet.
Deploy a reverse proxy with a web application firewall (WAF) ruleset that blocks requests containing shell metacharacters in RAID-related RPC parameters.

bash

# Configuration example: restrict the OpenMediaVault admin UI to a management subnet
# /etc/nginx/conf.d/openmediavault-restrict.conf
location /rpc.php {
    allow 10.10.20.0/24;   # management network only
    deny  all;
    include /etc/nginx/openmediavault-webgui-proxy.conf;
}