CVE-2026-70599: Electron Permission Check Handler Receives Main Vulnerability
MODERATECVE-2026-70599 is a MODERATE (CVSS 5.9) permission check handler receives main vulnerability (CWE-346: Origin Validation Error) affecting Electron libraries in the npm ecosystem. The issue involves permission check handler receives main frame origin instead of requesting iframe origin. Remediation is available by upgrading affected packages to version 39.8.7, 40.9.0, 41.2.0, 42.0.0-beta.1.
CVE-2026-70599 at a Glance
Security Impact
CVSS: 5.9
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2026-70599
To remediate this vulnerability, upgrade all affected Electron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install electron@39.8.7npm install electron@40.9.0npm install electron@41.2.0npm install electron@42.0.0-beta.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls electronHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-70599, inspect your project dependencies using npm:
npm ls electronAnalyze the terminal output to locate any version of Electron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 39.8.7), your application is affected.
Note: The npm ls electron command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-346: Origin Validation Error, where the product does not properly verify that the source of data or communication is valid. In Electron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-70599 Affected Electron Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
electron
|
npm |
< 39.8.7
|
39.8.7
|
|
electron
|
npm |
≥ 40.0.0-alpha.1
< 40.9.0
|
40.9.0
|
|
electron
|
npm |
≥ 41.0.0-alpha.1
< 41.2.0
|
41.2.0
|
|
electron
|
npm |
≥ 42.0.0-alpha.1
< 42.0.0-beta.1
|
42.0.0-beta.1
|
References
Frequently Asked Questions
What is CVE-2026-70599?
Which Electron versions are affected?
What version fixes CVE-2026-70599?
Is electron affected?
What is the CVSS score of CVE-2026-70599?
What CWE is associated with CVE-2026-70599?
How can I check npm dependencies for CVE-2026-70599?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9pf5-hg6p-4pwp",
"modified" : "2026-08-05T15:36:09Z",
"published" : "2026-08-05T15:36:09Z",
"aliases" : [ "CVE-2026-70599" ],
"summary" : "Electron: Permission Check Handler Receives Main Frame Origin Instead of Requesting Iframe Origin",
"details" : "### Impact\nFor serial-port and media (camera / microphone) permission checks made from an iframe, the `requestingOrigin` passed to `session.setPermissionCheckHandler` was the top-level frame's origin rather than the requesting frame's. Origin-based handler logic could therefore grant a cross-origin iframe device access intended only for the top-level origin.\n\nApps are only affected if they use `setPermissionCheckHandler` with origin-based logic and embed cross-origin iframes with delegated device permissions. Apps that base the decision on `details.securityOrigin`, or that do not embed such iframes, are not affected.\n\n### Workarounds\nCheck `details.securityOrigin` instead of `requestingOrigin` for these permissions, or do not delegate device permissions to untrusted iframes.\n\n### Fixed Versions\n* `42.0.0-beta.1`\n* `41.2.0`\n* `40.9.0`\n* `39.8.7`\n\n### For more information\nIf you have any questions or comments about this advisory, email Electron at [security@electronjs.org](mailto:security@electronjs.org)",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "electron"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "39.8.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "electron"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "40.0.0-alpha.1"
}, {
"fixed" : "40.9.0"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "electron"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "41.0.0-alpha.1"
}, {
"fixed" : "41.2.0"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "electron"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "42.0.0-alpha.1"
}, {
"fixed" : "42.0.0-beta.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/electron/electron/security/advisories/GHSA-9pf5-hg6p-4pwp"
}, {
"type" : "WEB",
"url" : "https://github.com/electron/electron/commit/0cbdf2f0375466d701aa393c92e0ec29eb89ea6c"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/electron/electron"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-346" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-08-05T15:36:09Z",
"nvd_published_at" : null
}
}