CVE-2026-34777: Electron Incorrect Origin Passed To Permission Vulnerability

MODERATE
Advisory Identifier: GHSA-r5p7-gp4j-qhrx
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CVSS 5.4
CWE-346
Published
Advisory Summary

CVE-2026-34777 is a MODERATE (CVSS 5.4) incorrect origin passed to permission vulnerability (CWE-346: Origin Validation Error) affecting Electron libraries in the npm ecosystem. The issue involves incorrect origin passed to permission request handler for iframe requests. Remediation is available by upgrading affected packages to version 38.8.6, 39.8.1, 40.8.1, 41.0.0.

CVE-2026-34777 at a Glance

CVE Identifier CVE-2026-34777
GHSA Identifier GHSA-r5p7-gp4j-qhrx
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-346: Origin Validation Error
Affected Product Electron
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-34777

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.

electron fixed: 38.8.6 
npm install electron@38.8.6
electron fixed: 39.8.1 
npm install electron@39.8.1
electron fixed: 40.8.1 
npm install electron@40.8.1
electron fixed: 41.0.0 
npm install electron@41.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls electron

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-34777, inspect your project dependencies using npm:

npm ls electron

Analyze 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 38.8.6), 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

### Impact When an iframe requests `fullscreen`, `pointerLock`, `keyboardLock`, `openExternal`, or `media` permissions, the origin passed to `session.setPermissionRequestHandler()` was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or `webContents.getURL()` may inadvertently grant permissions to embedded third-party content. The correct requesting URL remains available via `details.requestingUrl`. Apps that already check `details.requestingUrl` are not affected. ### Workarounds In your `setPermissionRequestHandler`, inspect `details.requestingUrl` rather than the origin parameter or `webContents.getURL()` when deciding whether to grant `fullscreen`, `pointerLock`, `keyboardLock`, `openExternal`, or `media` permissions. ### Fixed Versions * `41.0.0` * `40.8.1` * `39.8.1` * `38.8.6` ### For more information If there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)

CVE-2026-34777 Affected Electron Versions

4 component(s)
Fixed Versions:
38.8.639.8.140.8.141.0.0
Product / Package Ecosystem Affected Versions Fixed Version
electron
npm/electron
npm
< 38.8.6
38.8.6
electron
npm/electron
npm
≥ 39.0.0-alpha.1
< 39.8.1
39.8.1
electron
npm/electron
npm
≥ 40.0.0-alpha.1
< 40.8.1
40.8.1
electron
npm/electron
npm
≥ 41.0.0-alpha.1
< 41.0.0
41.0.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/electron/electron/security/advisories/GHSA-r5p7-gp4j-qhrx
NVD — CVE-2026-34777 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34777
Electron Source Repository REPOSITORY
https://github.com/electron/electron

Frequently Asked Questions

What is CVE-2026-34777?
CVE-2026-34777 is a security vulnerability in Electron involving Incorrect origin passed to permission request handler for iframe requests under CWE-346: Origin Validation Error.
Which Electron versions are affected?
Affected versions include releases prior to 38.8.6, 39.8.1, 40.8.1, 41.0.0 across affected packages: electron.
What version fixes CVE-2026-34777?
Upgrading to 38.8.6, 39.8.1, 40.8.1, 41.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is electron affected?
Yes, electron is affected in releases prior to 38.8.6, 39.8.1, 40.8.1, 41.0.0. Upgrade your dependency to 38.8.6, 39.8.1, 40.8.1, 41.0.0 or later.
What is the CVSS score of CVE-2026-34777?
CVE-2026-34777 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-34777?
CVE-2026-34777 is classified under CWE-346: Origin Validation Error (The product does not properly verify that the source of data or communication is valid.).
How can I check npm dependencies for CVE-2026-34777?
Run the dependency tree command: 'npm ls electron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r5p7-gp4j-qhrx",
  "modified" : "2026-04-06T23:11:08Z",
  "published" : "2026-04-03T02:44:26Z",
  "aliases" : [ "CVE-2026-34777" ],
  "summary" : "Electron: Incorrect origin passed to permission request handler for iframe requests",
  "details" : "### Impact\nWhen an iframe requests `fullscreen`, `pointerLock`, `keyboardLock`, `openExternal`, or `media` permissions, the origin passed to `session.setPermissionRequestHandler()` was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or `webContents.getURL()` may inadvertently grant permissions to embedded third-party content.\n\nThe correct requesting URL remains available via `details.requestingUrl`. Apps that already check `details.requestingUrl` are not affected.\n\n### Workarounds\nIn your `setPermissionRequestHandler`, inspect `details.requestingUrl` rather than the origin parameter or `webContents.getURL()` when deciding whether to grant `fullscreen`, `pointerLock`, `keyboardLock`, `openExternal`, or `media` permissions.\n\n### Fixed Versions\n* `41.0.0`\n* `40.8.1`\n* `39.8.1`\n* `38.8.6`\n\n### For more information\nIf there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "38.8.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "39.0.0-alpha.1"
      }, {
        "fixed" : "39.8.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "40.0.0-alpha.1"
      }, {
        "fixed" : "40.8.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "41.0.0-alpha.1"
      }, {
        "fixed" : "41.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/security/advisories/GHSA-r5p7-gp4j-qhrx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34777"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/electron/electron"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-03T02:44:26Z",
    "nvd_published_at" : "2026-04-04T00:16:18Z"
  }
}