Electron up to 39.8.7/40.8.x/41.2.0/42.0.0-beta.2 Extension Tab/Scripting APIs information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in Electron up to 39.8.7/40.8.x/41.2.0/42.0.0-beta.2. This impacts an unknown function of the component Extension Tab/Scripting APIs. The manipulation leads to information disclosure. This vulnerability is referenced as CVE-2026-70602. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Electron up to 39.8.7/40.8.x/41.2.0/42.0.0-beta.2 and classified as problematic. This issue affects an unknown code of the component Extension Tab/Scripting APIs. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session. Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. This issue is fixed in versions 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-70602 since 08/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 39.8.8, 40.9.0, 41.2.1 or 42.0.0-beta.3 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Electron

Version

• 39.8.0
• 39.8.1
• 39.8.2
• 39.8.3
• 39.8.4
• 39.8.5
• 39.8.6
• 39.8.7
• 40.0
• 40.1
• 40.2
• 40.3
• 40.4
• 40.5
• 40.6
• 40.7
• 40.8
• 41.0
• 41.1
• 41.2.0
• 42.0.0-beta.0
• 42.0.0-beta.1
• 42.0.0-beta.2

Website

• Product: https://github.com/electron/electron/

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