CVE-2026-34765: Electron Named Window.open Targets Not Scoped Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-f3pv-wv63-48x8",
  "modified" : "2026-04-08T11:57:01Z",
  "published" : "2026-04-07T15:52:25Z",
  "aliases" : [ "CVE-2026-34765" ],
  "summary" : "Electron: Named window.open targets not scoped to the opener's browsing context",
  "details" : "### Impact\nWhen a renderer calls `window.open()` with a target name, Electron did not correctly scope the named-window lookup to the opener's browsing context group. A renderer could navigate an existing child window that was opened by a different, unrelated renderer if both used the same target name. If that existing child was created with more permissive `webPreferences` (via `setWindowOpenHandler`'s `overrideBrowserWindowOptions`), content loaded by the second renderer inherits those permissions.\n\nApps are only affected if they open multiple top-level windows with differing trust levels **and** use `setWindowOpenHandler` to grant child windows elevated `webPreferences` such as a privileged preload script. Apps that do not elevate child window privileges, or that use a single top-level window, are not affected.\n\nApps that additionally grant `nodeIntegration: true` or `sandbox: false` to child windows (contrary to the [security recommendations](https://www.electronjs.org/docs/latest/tutorial/security)) may be exposed to arbitrary code execution.\n\n### Workarounds\nDeny `window.open()` in renderers that load untrusted content by returning `{ action: 'deny' }` from `setWindowOpenHandler`. Avoid granting child windows more permissive `webPreferences` than their opener.\n\n### Fixed Versions\n* `42.0.0-alpha.5`\n* `41.1.0`\n* `40.8.5`\n* `39.8.5`\n\n### For more information\nIf you have any questions or comments about this advisory, email us at [security@electronjs.org](mailto:security@electronjs.org)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "39.8.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "40.0.0-alpha.1"
      }, {
        "fixed" : "40.8.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "41.0.0-alpha.1"
      }, {
        "fixed" : "41.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "42.0.0-alpha.1"
      }, {
        "fixed" : "42.0.0-alpha.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/security/advisories/GHSA-f3pv-wv63-48x8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34765"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/electron/electron"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v39.8.5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v40.8.5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v41.1.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/releases/tag/v42.0.0-alpha.5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-668" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-07T15:52:25Z",
    "nvd_published_at" : "2026-04-07T22:16:22Z"
  }
}