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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (46.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Electron — versions < 39.8.8, >= 40.0.0-alpha.1, < 40.9.0, >= 41.0.0-alpha.1, < 41.2.1
- Electronjs Electron — versions 42.0.0
Weakness classification (CWE)
References
- github.com/electron/electron/security/advisories/GHSA-v93f-fgjr-hjrj (Vendor Advisory)
- github.com/electron/electron/pull/50946 (Patch, Issue Tracking)
- github.com/electron/electron/pull/50947 (Patch, Issue Tracking)
- github.com/electron/electron/pull/50948 (Patch, Issue Tracking)
- github.com/electron/electron/pull/50949 (Patch, Issue Tracking)
- github.com/electron/electron/commit/30cf3882de75ee651bd4e5f27002f13fd3d3163a (Patch)
- github.com/electron/electron/commit/4eff3dc09e4d1e62d649c5ce9902f532bb7469c7 (Patch)
- github.com/electron/electron/commit/615d62500fc7732d068274b796c49487e652e90b (Patch)
- github.com/electron/electron/commit/fe2e7d0073949b4593b624b93abf1788f5377e55 (Patch)
- github.com/electron/electron/releases/tag/v39.8.8 (Release Notes)
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.