CVE-2026-70599 Electron: Permission Check Handler Receives Main Frame Origin Instead of Requesting Iframe Origin
Electron developers must upgrade to prevent cross-origin iframes from bypassing permission checks for serial and media devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-70599?
CVE-2026-70599 is a medium-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 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, serial-port and media permission checks made from an iframe passed the top-level frame origin to session.setPermissionCheckHandler instead of the requesting iframe origin. Origin-based handler logic could grant a cross-origin iframe device access intended only for the top-level origin. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.
Weakness: CWE-346
Which versions are affected by CVE-2026-70599?
8 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 39.8.7 |
electron npm | All versions | 39.8.7 |
electron npm | From 40.0.0-alpha.1 | 40.9.0 |
electron npm | From 40.0.0-alpha.1 | 40.9.0 |
electron npm | From 41.0.0-alpha.1 | 41.2.0 |
electron npm | From 41.0.0-alpha.1 | 41.2.0 |
2 more packages
electron npm | From 42.0.0-alpha.1 | 42.0.0-beta.1 |
electron npm | From 42.0.0-alpha.1 | 42.0.0-beta.1 |
Products include Electronjs Electron.
How do I fix CVE-2026-70599?
Upgrade electron to a fixed version for your release line: 39.8.7, 40.9.0, 41.2.0 or 42.0.0-beta.1.
Is CVE-2026-70599 being exploited?
There is no known exploitation of CVE-2026-70599 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-9pf5-hg6p-4pwp.