CVE-2026-34765 Electron named window.open targets not scoped to the opener's browsing context
Attackers can bypass security boundaries to execute code if apps use multiple windows with elevated privileges in Electron.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34765?
CVE-2026-34765 is a medium-severity vulnerability in Electronjs Electron, published on 7 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-668
Which versions are affected by CVE-2026-34765?
8 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 39.8.5 |
electron npm | All versions | 39.8.5 |
electron npm | From 40.0.0-alpha.1 | 40.8.5 |
electron npm | From 40.0.0-alpha.1 | 40.8.5 |
electron npm | From 41.0.0-alpha.1 | 41.1.0 |
electron npm | From 41.0.0-alpha.1 | 41.1.0 |
2 more packages
electron npm | From 42.0.0-alpha.1 | 42.0.0-alpha.5 |
electron npm | From 42.0.0-alpha.1 | 42.0.0-alpha.5 |
Products include Electronjs Electron.
How do I fix CVE-2026-34765?
Upgrade electron to a fixed version for your release line: 39.8.5, 40.8.5, 41.1.0 or 42.0.0-alpha.5.
Is CVE-2026-34765 being exploited?
There is no known exploitation of CVE-2026-34765 in the wild and no public exploit code.
Other vulnerabilities in Electronjs Electron
- CVE-2017-16151 Chromium Remote Code Execution in electron
- CVE-2018-1000118 Electron protocol handler browser vulnerable to Command Injection
- CVE-2026-34780 Electron: Context Isolation bypass via contextBridge VideoFrame transfer
- CVE-2026-102676 Electron: <webview> can enable Node.js integration in Web Workers despite embedder restrictions
- CVE-2026-102673 Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab
Sources
Also known as GHSA-f3pv-wv63-48x8.