Unauthenticated OS command injection enables root execution in Nextcloud NextCloudPi

NextcloudPi is a ready to use image for Virtual Machines, Raspberry Pi, Odroid HC1, Rock64 and other boards. A command injection vulnerability in NextCloudPi allows command execution as the root user via the NextCloudPi web-panel. Due to a security misconfiguration this can be used by anyone with access to NextCloudPi web-panel, no authentication is required. It is recommended that the NextCloudPi is upgraded to 1.53.1.

• Nextcloud NextCloudPi: versions <=1.53.0 are identified as affected.
• Patched release: 1.53.1.
• The available evidence does not establish the status of every later or parallel release branch. Do not assume that an unverified branch is unaffected solely because this patched release exists.

Nextcloud NextCloudPi contains an OS command injection flaw classified as CWE-78. Attacker-controlled data can reach command execution without adequate neutralization, allowing commands to run as the root user on the system hosting NextCloudPi. Exploitation requires network access to the NextCloudPi web-panel, but no authentication or user interaction. The available record does not identify the vulnerable input field, handler, operating-system command, or specific endpoint. Because execution occurs with root privileges, successful exploitation could extend beyond the web-panel and affect the underlying appliance or host system.

The flaw is remotely reachable through the NextCloudPi web-panel over the network. The attacker does not need authentication, prior privileges, or interaction from another user, and the recorded attack complexity is low. The record does not provide a payload, exploit sequence, or specific endpoint, so a detailed exploitation procedure cannot be established. The supplied record does not confirm real-world exploitation and does not identify a public exploit; that does not prove exploitation has not occurred.

The flaw allows an unauthenticated remote request to result in command execution as root on the NextCloudPi system. The technical outcome can include loss of confidentiality, integrity, and availability for data or services accessible to the appliance. root privileges could also allow impact to other components on the same system; this is a possible consequence of the documented execution privilege, not a disclosed implementation detail. The record does not define the exact boundary of impact beyond the web-panel.

Successful exploitation could provide root command execution on a NextCloudPi appliance. Possible consequences include unauthorized access to data, modification of files or configuration, persistent system changes, and service disruption. Because authentication is not required, exposing the web-panel increases risk for appliances used to store or serve sensitive data. The record does not identify a specific breach, victim, or campaign.

1. Upgrade NextCloudPi to the patched release 1.53.1, then verify that the deployed appliance is actually running the updated release.
2. If upgrading is not immediately possible, do not expose the NextCloudPi web-panel to the Internet or to public or untrusted networks. This is the vendor-stated workaround and does not replace upgrading.
3. Review the full deployment inventory for appliances or images still within <=1.53.0, including systems outside centralized management.
4. For release branches not covered by the advisory, verify status with the vendor rather than inferring that they are fixed.

1. Inventory appliances, images, and virtual machines running NextCloudPi, then verify each installed release against the vendor's patched release.
2. Identify systems where the NextCloudPi web-panel is reachable from the Internet or from public and untrusted networks.
3. Review web-panel access logs and host command-execution telemetry for unusual activity associated with unauthenticated requests. Treat this as precautionary review, not as a vendor-confirmed IOC.
4. Do not treat the absence of suspicious log entries as proof of safety; independently verify the installed release and network exposure.