External risk intelligence

Pi.Alert Unauthenticated Remote Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-44887

Pi.Alert is designed as a web-based monitoring service for network security. Because it provides a web-accessible dashboard and configuration interface that is reachable over the network, it is commonly deployed as a web-facing service for administration, making it likely to be accessible if the host is exposed to the local network or internet.

Code Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

Pi.Alert, a network security monitoring tool, has a critical vulnerability that could allow an attacker to execute arbitrary code remotely. This issue arises from how its web configuration editor handles certain inputs, which, without authentication, could enable unauthorized code execution with the privileges of the system's daemon process.

Code execution flaw in network monitoring tool.
Critical remote code execution, no authentication needed.
Confirm if this product is used and exposed.

Attack Path

How an attacker could exploit the issue

An attacker could compromise Pi.Alert by exploiting a flaw in its web-based configuration editor. Because the system's configuration file is loaded and executed as Python code by a background process, an attacker can inject arbitrary Python commands into this file. If web protection is turned off, which is the default setting, no login is needed, allowing unauthenticated attackers to execute commands with the same privileges as the background daemon.

No authentication needed.
Arbitrary code injection in configuration.
Remote code execution on daemon.

Live Threat

Current exploitation, exposure, and threat context

When Pi.Alert's web-based configuration editor is accessible without authentication, attackers could inject arbitrary Python code. This code would then execute with the privileges of the Pi.Alert daemon, potentially affecting the integrity of system configurations and service operations.

System configuration files could be altered.
Arbitrary code could run over the network.
System integrity and service availability may be impacted.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Pi.Alert's web-based configuration editor enables unauthenticated remote code execution, impacting systems where the web protection feature is disabled. Infrastructure and platform teams are likely responsible for identifying affected installations, confirming their accessibility and criticality, and coordinating remediation with the vendor.

Own the issue: Infrastructure and Platform teams.
Verify first: Identify and assess Pi.Alert instances.
Action: Coordinate vendor fix and plan remediation.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is Pi.Alert?

Pi.Alert is a monitoring tool designed to track devices on your network, such as Wi-Fi and LAN connections, while also providing web-based oversight of services. It is typically used to gain visibility into network traffic and identify unauthorized devices, functioning as a security utility that administrators manage through a web interface.

What does CWE-94 mean for CVE-2026-44887?

This vulnerability is classified as CWE-94, which refers to Improper Control of Generation of Code. In this specific case, the software takes input from its web configuration editor and saves it directly into a file that the system later treats as executable code. Because the application uses Python's exec() function to load this file, any injected commands are run automatically by the background process.

How does an attacker trigger this vulnerability?

An attacker triggers this by interacting with the web-based configuration editor to inject arbitrary Python commands into the application's configuration file. It is important to note that this only leads to code execution if the default configuration remains active where web protection is disabled; if you have enabled authentication to protect the interface, the attacker cannot reach the configuration editor to inject the code.

Is my Pi.Alert instance at risk?

According to Halo Surface Signal, Pi.Alert is commonly deployed as a web-accessible dashboard, which increases the likelihood that it is reachable over your network. If your installation is accessible via the network and you have not enabled web protection, your system is at risk because the configuration interface does not require authentication to accept malicious input.

What should I do to address this issue?

Your first step is to confirm whether you are running a version of Pi.Alert released prior to May 7, 2026. If you are, you must update to a newer version that contains the fix. While planning the update, verify if your web interface is exposed to the network and ensure that authentication features are enabled to limit unauthorized access to the configuration settings.

References

github.com/leiweibau/Pi.Alert/security/advisories/GHSA-r59g-5wf9…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.