CVE-2026-86711 in Electerm
Summary
by MITRE • 09/08/2026
electerm before 5.3.15 exposes 40+ main-process functions through an unvalidated Electron IPC handler with no function-name allowlist or sender validation. Renderer-side script execution can invoke openFileWithEditor and other functions with arbitrary arguments to execute system commands in the main process.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in electerm versions prior to 5.3.15 represents a critical security flaw rooted in improper implementation of Inter-Process Communication (IPC) mechanisms within an Electron-based application architecture. Electron applications typically consist of a main process that controls the native resources and one or more renderer processes that handle web page content, separated by strict isolation boundaries enforced via IPC channels. In this specific case, the application exposes over forty distinct functions from the privileged main process to untrusted renderer-side scripts through an insecurely configured IPC handler. The core technical deficiency lies in the complete absence of validation mechanisms for incoming requests. Specifically, there is no function-name allowlist to restrict which methods can be invoked, nor is there any sender validation to verify that the request originates from a trusted internal source rather than malicious external or injected code. This design oversight effectively bypasses the security boundary between the untrusted renderer context and the privileged main process environment.
From an operational perspective, this architectural flaw allows for arbitrary command execution on the host system under the privileges of the user running the application. An attacker who can achieve remote code execution within a renderer process, or trick a user into executing malicious script content loaded by electerm, can directly invoke sensitive functions such as openFileWithEditor and others exposed through the unvalidated handler. By passing arbitrary arguments to these functions, the attacker gains the ability to execute system commands with the same level of access as the application itself. This capability transforms what might otherwise be a cross-site scripting or code injection vulnerability into a full remote code execution scenario, enabling actions such as data exfiltration, installation of persistent malware, modification of system configurations, and lateral movement within a network if the compromised host is part of a larger infrastructure.
This vulnerability aligns with CWE-94 Improper Control of Generation of Code (Code Injection) and CWE-78 Improper Neutralization of Special Elements used in an OS Command (OS Command Injection), as it allows untrusted input to dictate system-level operations. Furthermore, the exploitation technique maps directly to MITRE ATT&CK techniques including T1059 Command and Scripting Interpreter for executing arbitrary commands and potentially T1203 File Execution for launching malicious binaries via editor functions. The lack of sender validation also reflects CWE-862 Missing Authorization, as the application fails to verify that the caller has permission to invoke specific privileged operations.
Mitigation strategies must focus on implementing strict access controls within the IPC layer. Developers should adopt a principle of least privilege by exposing only those main process functions absolutely necessary for renderer interaction and ensuring they are protected by robust allowlists. It is critical to implement sender validation checks that verify the origin of every IPC message, rejecting any requests from untrusted or unknown sources. Additionally, input sanitization must be applied to all arguments passed through IPC channels to prevent command injection payloads. Upgrading electerm to version 5.3.15 or later resolves this issue by patching these insecure communication pathways and enforcing proper security boundaries between processes.