Is CVE-2026-70599 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-70599?

CVE-2026-70599 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-70599

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1, serial-port and media permission checks made from an iframe passed the top-level frame origin to session.setPermissionCheckHandler instead of the requesting iframe origin. Origin-based handler logic could grant a cross-origin iframe device access intended only for the top-level origin. This issue is fixed in 39.8.7, 40.9.0, 41.2.0, and 42.0.0-beta.1.