Login Request a demo
Medium severity · published Aug 5, 2026
CVE-2026-70599
Electron: Permission Check Handler Receives Main Frame Origin Instead of Requesting Iframe Origin
5.9
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
electron · electron
< 39.8.7; >= 40.0.0-alpha.1, < 40.9.0; >= 41.0.0-alpha.1, < 41.2.0; >= 42.0.0-alpha.1, < 42.0.0-beta.1 · source: vendor, NVD
Affected product
EL
electron
electron
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70599
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70599
Patch
https://github.com/electron/electron/commit/0cbdf2f0375466d701aa393c92e0ec29eb89ea6c
Vendor Advisory
https://github.com/electron/electron/security/advisories/GHSA-9pf5-hg6p-4pwp
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