Electron up to 39.8.4/40.8.4/41.0.x window.open exposure of resource

Summaryinfo

A vulnerability was found in Electron up to 39.8.4/40.8.4/41.0.x. It has been declared as problematic. The impacted element is the function window.open. The manipulation results in exposure of resource. This vulnerability is identified as CVE-2026-34765. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Electron up to 39.8.4/40.8.4/41.0.x. It has been classified as problematic. Affected is the function window.open. The manipulation with an unknown input leads to a exposure of resource vulnerability. CWE is classifying the issue as CWE-668. The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.5, 40.8.5, 41.1.0, and 42.0.0-alpha.5, when a renderer calls window.open() with a target name, Electron did not correctly scope the named-window lookup to the opener's browsing context group. A renderer could navigate an existing child window that was opened by a different, unrelated renderer if both used the same target name. If that existing child was created with more permissive webPreferences (via setWindowOpenHandler's overrideBrowserWindowOptions), content loaded by the second renderer inherits those permissions. Apps are only affected if they open multiple top-level windows with differing trust levels and use setWindowOpenHandler to grant child windows elevated webPreferences such as a privileged preload script. Apps that do not elevate child window privileges, or that use a single top-level window, are not affected. Apps that additionally grant nodeIntegration: true or sandbox: false to child windows (contrary to the security recommendations) may be exposed to arbitrary code execution. This vulnerability is fixed in 39.8.5, 40.8.5, 41.1.0, and 42.0.0-alpha.5.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34765 since 03/30/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. There are known technical details, but no exploit is available.

Upgrading to version 39.8.5, 40.8.5, 41.1.0 or 42.0.0-alpha.5 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Electron

Version

• 39.8.0
• 39.8.1
• 39.8.2
• 39.8.3
• 39.8.4
• 40.8.0
• 40.8.1
• 40.8.2
• 40.8.3
• 40.8.4
• 41.0

Website

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

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