External risk intelligence

Froxlor server software can be taken over by an attacker.

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-41229

Froxlor server software has a critical flaw allowing attackers with admin access to run any code they want on your server, impacting all users and data. Update to version 2.3.6 immediately.

4Halo Surface Signal

Code Injection

Froxlor

before 2.3.6

External exposure likelihood

Halo Surface Signal score for CVE-2026-41229

Froxlor is a web-based server administration interface. These platforms are commonly deployed as externally reachable management surfaces to facilitate remote access for administrators, making the application's interface a likely candidate for public internet exposure in many standard deployments.

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in Froxlor allows an attacker with administrative privileges to inject malicious code. This code runs automatically on every page load, potentially compromising the entire server.

  • Code execution as web server user.
  • Affected if using Froxlor versions before 2.3.6.
  • Requires administrative access to exploit.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this by crafting a malicious `privileged_user` parameter when adding or updating a MySQL server via the API. Since the application writes this unescaped value into a configuration file that's included on every request, arbitrary PHP code can be injected and executed with the web server's privileges.

  • Requires admin privileges.
  • Targets API endpoint.
  • Writes unescaped data to config.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows for arbitrary PHP code injection through the API, which executes with web server privileges. Attackers are likely to target this because it enables remote code execution and has a direct impact on server security.

  • Exploitation requires admin privileges.
  • No public exploit available.
  • Version 2.3.6 addresses the issue.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Focus on patching Froxlor to version 2.3.6 immediately, as unpatched instances are critically vulnerable to remote code execution. If immediate patching is not feasible, implement strict access controls to the Froxlor API and limit administrative privileges to only essential personnel.

  • Patch Froxlor to version 2.3.6.
  • Restrict API access to privileged users.
  • Monitor for unauthorized configuration changes.

Frequently asked questions

What is Froxlor and what is it used for?

Froxlor is open-source server administration software that helps manage servers. It provides an interface for administrators to handle various server tasks and configurations, making server management more streamlined.

How does CVE-2026-41229 threaten Froxlor systems?

CVE-2026-41229 is a critical vulnerability classified as Improper Neutralization of Special Elements in Output Used as Code (CWE-94). It allows an attacker with administrative privileges to inject arbitrary PHP code into Froxlor. This code then executes automatically on every page load with the web server's permissions, potentially compromising the entire server.

What are the conditions needed to exploit this CVE in Froxlor?

An attacker must possess administrative privileges within Froxlor and have the `change_serversettings` permission. They can exploit the vulnerability by adding or updating a MySQL server via the API and providing a specially crafted, unescaped value for the `privileged_user` parameter.

Who should be concerned about this Froxlor vulnerability?

Organizations using Froxlor versions prior to 2.3.6 should be concerned. The Halo Surface Signal indicates this is likely to be externally exposed, meaning internet-facing management interfaces could be at risk if not properly secured.

What is the first step to address this Froxlor vulnerability?

The immediate and most crucial step is to update Froxlor to version 2.3.6 or later. This version includes a patch that resolves the vulnerability.

References