CVE-2026-70608 Electron: Sandboxed iframe can bypass the allow-popups restriction via the OpenURL navigation path
Attackers can bypass sandboxed iframe popup restrictions in Electron to open new windows without user interaction, affecting apps embedding untrusted content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-70608?
CVE-2026-70608 is a high-severity vulnerability in Electronjs Electron, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, 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 39.8.10, 41.10.3, and 42.0.1, a sandboxed iframe without the allow-popups keyword could still open a new window or trigger setWindowOpenHandler with no user interaction because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction. Apps that embed untrusted content in sandboxed iframes and rely on the absence of allow-popups to prevent window creation are affected, while apps that deny window creation in setWindowOpenHandler or do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in 39.8.10, 41.10.3, and 42.0.1.
Which versions are affected by CVE-2026-70608?
6 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 39.8.10 |
electron npm | All versions | 39.8.10 |
electron npm | From 40.0.0-alpha.1 | 41.10.3 |
electron npm | From 40.0.0-alpha.1 | 41.10.3 |
electron npm | From 42.0.0-alpha.1 | 42.0.1 |
electron npm | From 42.0.0-alpha.1 | 42.0.1 |
Products include Electronjs Electron.
How do I fix CVE-2026-70608?
Upgrade electron to a fixed version for your release line: 39.8.10, 41.10.3 or 42.0.1.
Is CVE-2026-70608 being exploited?
There is no known exploitation of CVE-2026-70608 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-9f4c-93c8-jc8g.