CVE-2026-70609 in Electron
Summary
by MITRE • 08/05/2026
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, the mode option of webContents.openDevTools() was not sanitized before use by the DevTools frontend. If an attacker can influence this value, script under their control may run in the DevTools context, which in unsandboxed configurations has access to Node.js, including when untrusted input reaches the mode argument of openDevTools() or untrusted content calls openDevTools() on a webview it embeds. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.
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Analysis
by VulDB Data Team • 08/05/2026
The vulnerability described represents a critical server-side request forgery and cross-site scripting flaw within the Electron framework that affects versions prior to specific patch releases. This issue stems from inadequate input sanitization in the webContents.openDevTools() method where the mode option parameter is not properly validated before being processed by the DevTools frontend component. The vulnerability exists in unsandboxed configurations where the DevTools context maintains access to Node.js runtime capabilities, creating a significant attack surface that could be exploited by malicious actors.
The technical flaw manifests when untrusted input flows into the mode argument of openDevTools() or when untrusted content triggers openDevTools() on embedded webview elements. This improper sanitization allows attackers to inject malicious scripts that execute within the DevTools context, potentially enabling arbitrary code execution with elevated privileges. The vulnerability is particularly dangerous because it operates in environments where the DevTools frontend has direct access to Node.js APIs, enabling attackers to perform operations such as file system access, process manipulation, and network communications that would otherwise be restricted.
From an operational impact perspective, this vulnerability creates a pathway for remote code execution attacks in Electron applications that utilize unsandboxed configurations or embed untrusted web content. The attack vector is particularly concerning because it can be triggered through user input or malicious web content without requiring additional privileges beyond what is already available to the application's frontend components. When exploited, the vulnerability allows attackers to bypass typical security boundaries that would normally separate frontend JavaScript execution from system-level operations, effectively elevating their control over the affected application.
The fix implemented in versions 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1 addresses this issue through proper input sanitization of the mode parameter before processing by the DevTools frontend. Security practitioners should note that this vulnerability aligns with CWE-79 (Cross-Site Scripting) and CWE-15 (External Control of System or Configuration Setting) categories, while also mapping to ATT&CK technique T1059.007 (Command and Scripting Interpreter: JavaScript) and T1203 (Exploitation for Client Execution). Organizations should prioritize updating their Electron applications to the patched versions and consider implementing additional input validation measures as defensive controls, particularly in environments where unsandboxed configurations are necessary for application functionality.
The broader implications of this vulnerability highlight the importance of proper input validation in framework components that interface with privileged execution contexts. This issue demonstrates how seemingly innocuous API parameters can become attack vectors when not properly sanitized, particularly in frameworks that provide access to system-level resources through their development tools. Security teams should implement comprehensive testing procedures to identify similar sanitization gaps in other framework methods and consider automated scanning tools to detect potential injection points in application code that interfaces with Electron's DevTools APIs.