Is CVE-2026-70607 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-70607 being exploited in the wild.

How severe is CVE-2026-70607?

Medium severity, with a CVSS score of 5.3, published 5 August 2026.

Which products and versions are affected?

electron (npm) SEMVER:introduced=0,fixed=39.8.8.

Is there a fix for CVE-2026-70607?

Yes. electron (npm): upgrade to 39.8.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-70607 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-70607?

Check whether you run electron (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-70607: Electron improper input validation in window.open features string

CVE-2026-70607 · Severity: medium · CVSS 5.3 · Published 2026-08-05

Electron, a framework used to build desktop applications with web technologies, contains a vulnerability where untrusted web content can manipulate window settings. By using specific commands when opening a new window, an attacker could force the application to access unauthorized files or network locations. This could lead to the exposure of sensitive local data or internal network information.

Technologies: electron (npm). Vendors: npm.

Quick answers

Is CVE-2026-70607 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-70607 being exploited in the wild.
How severe is CVE-2026-70607?: Medium severity, with a CVSS score of 5.3, published 5 August 2026.
Which products and versions are affected?: electron (npm) SEMVER:introduced=0,fixed=39.8.8.
Is there a fix for CVE-2026-70607?: Yes. electron (npm): upgrade to 39.8.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-70607 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-70607?: Check whether you run electron (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

electron (npm): upgrade to 39.8.8 or later
```
npm install electron@39.8.8
```

Technical details

A vulnerability in Electron's handling of the window.open() features string allows untrusted web content to specify privileged BrowserWindow options that are not properly allowlisted. By crafting a specific features string, an attacker can bypass intended restrictions and set options that cause the main process to access attacker-controlled file or network paths. This is classified as improper input validation (CWE-20). The vulnerability affects applications that allow untrusted content to call window.open() without implementing a setWindowOpenHandler to deny or override child window options. Patches have been released in versions 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

Affected products

Electron Electron < 39.8.8, >= 40.0.0-alpha.1 < 40.9.0, >= 41.0.0-alpha.1 < 41.2.1, >= 42.0.0-alpha.1 < 42.0.0-beta.3

Identifiers

CVE-2026-70607
GHSA-v93f-fgjr-hjrj

Timeline

2026-04-11: patched: Initial backport PRs merged into various release branches.
2026-07-27: disclosed: Advisory published by Electron maintainers.
2026-08-05: advisory: GitHub Advisory reviewed and updated.

References

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