CVE-2026-70602 Electron: Extension tab APIs operate across session boundaries
A malicious extension can access data from other sessions if the app uses separate sessions for isolation, requiring an upgrade to Electron.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-70602?
CVE-2026-70602 is a medium-severity missing authorization vulnerability in Electronjs Electron, published on 5 Aug 2026. An attacker needs administrator access to exploit it, 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 39.8.8, 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-70602?
8 open source packages ship an affected version, including electron. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
electron npm | All versions | 39.8.8 |
electron npm | All versions | 39.8.8 |
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 | 41.2.1 |
electron npm | From 41.0.0-alpha.1 | 41.2.1 |
2 more packages
electron npm | From 42.0.0-alpha.1 | 42.0.0-beta.3 |
electron npm | From 42.0.0-alpha.1 | 42.0.0-beta.3 |
Products include Electronjs Electron.
How do I fix CVE-2026-70602?
Upgrade electron to a fixed version for your release line: 39.8.8, 40.9.0, 41.2.1 or 42.0.0-beta.3.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-70602 being exploited?
There is no known exploitation of CVE-2026-70602 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-m55f-7gqj-fr98.