External risk intelligence

Electerm could allow an internal attacker to run malicious commands on a user's machine

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-41500

Electerm contains a flaw that could allow an internal attacker to execute unauthorized commands on a user's machine. This issue puts stored credentials and sensitive network infrastructure at risk of exposure, potentially leading to full system compromise.

1Halo Surface Signal

Command Injection

Electerm Project Electerm

before 3.3.8

External exposure likelihood

Halo Surface Signal score for CVE-2026-41500

Electerm is a client-side terminal and management application installed on local workstations. The vulnerability exists within the update and installation mechanism, which is not a public-facing network service or listening daemon. Consequently, the affected surface is inherently local to the host machine rather than a reachable network endpoint.

Horizon Alert

Summary of the vulnerability and why it matters

A command injection vulnerability in electerm allows an attacker to run arbitrary commands on a user's machine. This is concerning because it can lead to a complete compromise of the affected system.

  • Can execute code remotely.
  • Affects users running electerm.
  • Critical severity rating.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this by tricking a user into installing or updating electerm with a malicious release name. This would allow them to execute arbitrary commands on the user's macOS machine during the installation process. The vulnerability lies in how the software handles remote release names when installing on macOS.

  • Requires user interaction.
  • Targets electerm's macOS installer.
  • Malicious release name needed.

Live Threat

Current exploitation, exposure, and threat context

Attackers are unlikely to weaponize this vulnerability because it affects a client-side application, electerm, which is installed on local workstations. The command injection flaw exists within the application's update and installation process, requiring local access or a user to trigger the vulnerable code. There are no observed exploitation attempts, public exploits, or KEV signals, and the vulnerability is patched.

  • Local client-side vulnerability.
  • No public exploit.
  • Patched in version 3.3.8.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize upgrading electerm to version 3.3.8 immediately, as this critical command injection vulnerability is present in all earlier versions. The exploitability via network and lack of user interaction required to trigger the vulnerability necessitates swift action to prevent potential remote code execution.

  • Upgrade electerm to version 3.3.8.
  • Monitor for signs of compromise.
  • Isolate affected systems if upgrade is delayed.

Frequently asked questions

What is electerm and what is it used for?

Electerm is an open-source client application used for various remote connections, including SSH, Telnet, RDP, VNC, and serial ports. It's a tool for managing and interacting with remote systems from your local computer.

What type of vulnerability is CVE-2026-41500 in electerm?

CVE-2026-41500 is a command injection vulnerability. This means an attacker could trick the software into executing unintended commands, potentially leading to unauthorized actions on the affected system.

How could an attacker exploit CVE-2026-41500 in electerm?

Exploitation requires an attacker to control a "remote releaseInfo.name" which is then incorporated without validation into an "open" command executed on macOS. This could occur during the installation or update process if a user is tricked into using a specially crafted release name.

Who should be concerned about this CVE-2026-41500 threat?

Users running electerm, especially on macOS, should be concerned. While the vulnerability is in a client-side application and not a direct network service, the Halo Surface Signal indicates the affected surface is local to the machine rather than a publicly reachable endpoint, suggesting internal or user-initiated attacks are more plausible.

What is the first step to address CVE-2026-41500?

The most critical first step is to upgrade electerm to version 3.3.8 or later. This version includes a patch that resolves the command injection vulnerability.

References