CVE-2026-70599

Electron: Permission Check Handler Receives Main Frame Origin Instead of Requesting Iframe Origin

MEDIUM

5.9

CVSS Score

Published: August 5, 2026 at 03:36 PM UTC

Updated: October 8, 2026 at 01:54 PM UTC

2 products affected across 2 vendorsElectronElectron

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Electron · Electronjsnpm

95%

v < 39.8.740.0.0 ≤ v < 40.9.041.0.0 ≤ v < 41.2.1*42.0.0 42.0.0 alpha1 42.0.0 alpha2 42.0.0 alpha3 42.0.0 alpha4 42.0.0 alpha5 42.0.0 alpha6 42.0.0 beta1 42.0.0 beta2

Affected range stops below 39.8.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.2.1, so it looks safe — our inference, not a vendor statement

Electron · Electron

90%

v < 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

Affected range stops below 39.8.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 40.9.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 41.2.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 42.0.0-beta.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMVendor Advisory

Source: cverecord

https://github.com/electron/electron/security/advisories/GHSA-9pf5-hg6p-4pwp

x_refsource_MISCPatch

Source: cverecord

https://github.com/electron/electron/commit/0cbdf2f0375466d701aa393c92e0ec29eb89ea6c

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-346

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