Vulnerability in Electron
CVE-2026-70608
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 41.10.3, and 42.0.1, a sandboxed iframe without the allow-popups keyword could still open a new window or trigger setWindowOpenHandler with no user interaction because new-window navigations taking the OpenURL path did not apply the iframe sandbox popup restriction. Apps that embed untrusted content in sandboxed iframes and rely on the absence of allow-popups to prevent window creation are affected, while apps that deny window creation in setWindowOpenHandler or do not embed untrusted content in sandboxed iframes are not affected. This issue is fixed in 39.8.10, 41.10.3, and 42.0.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- Electron — versions < 39.8.10, >= 40.0.0-alpha.1, < 41.10.3, >= 42.0.0-alpha.1, < 42.0.1
- Electronjs Electron
Weakness classification (CWE)
References
- github.com/electron/electron/security/advisories/GHSA-9f4c-93c8-jc8g (Vendor Advisory)
- github.com/electron/electron/pull/51437 (Patch, Issue Tracking)
- github.com/electron/electron/pull/51438 (Patch, Issue Tracking)
- github.com/electron/electron/pull/51439 (Patch, Issue Tracking)
- github.com/electron/electron/commit/3ff23c52ab364a0afc6ab5bd7851291d3159de57 (Patch)
- github.com/electron/electron/commit/57cbe329c4ae8aab5ac5ebdcb588adc9a11de0d3 (Patch)
- github.com/electron/electron/commit/68cf8b7d9122260f6b534a69a82c701a56cf159f (Patch)
- github.com/electron/electron/releases/tag/v39.8.10 (Release Notes)
- github.com/electron/electron/releases/tag/v41.10.3 (Release Notes)
- github.com/electron/electron/releases/tag/v42.0.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-70608?
- CVE-2026-70608 is a high-severity vulnerability in Electron, classified under Protection Mechanism Failure. CVSS score: 7.2/10. Published 2026-08-05.
- How severe is CVE-2026-70608?
- High severity. CVSS v3 base score is 7.2 out of 10.