Improper input validation in Electron

CVE-2026-70607

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, some window options supplied by web content in the window.open() features string were applied to the new BrowserWindow without an allowlist. Untrusted content could set window options it should not control, including options that cause the main process to access attacker-chosen file or network paths, when untrusted content can call window.open() and the app does not override child window options via setWindowOpenHandler or overrideBrowserWindowOptions. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (37.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

  • Electron — versions < 39.8.8, >= 40.0.0-alpha.1, < 40.9.0, >= 41.0.0-alpha.1, < 41.2.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-70607?
CVE-2026-70607 is a medium-severity vulnerability in Electron, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-08-05.
How severe is CVE-2026-70607?
Medium severity. CVSS v3 base score is 5.3 out of 10.