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🛡️ CVE-2026-34765 — electron

🟡 CVSS 6.0 — Medium ✅ No Known Exploit CWE-668 OSV
6.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Electron: Named window.open targets not scoped to the opener's browsing context

Impact

When 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.

Apps 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.

Apps 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.

Workarounds

Deny window.open() in renderers that load untrusted content by returning { action: 'deny' } from setWindowOpenHandler. Avoid granting child windows more permissive webPreferences than their opener.

Fixed Versions

  • 42.0.0-alpha.5
  • 41.1.0
  • 40.8.5
  • 39.8.5

For more information

If you have any questions or comments about this advisory, email us at [[email protected]](mailto:[email protected])

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2026-34765 is classified as CWE-668: Exposure of Resource to Wrong Sphere. A resource is made reachable from a context that should not have access to it.

Affected software

CVE-2026-34765 is recorded against 1 package.

  • electron

Timeline and source

Published on 7 April 2026 and last revised on 24 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)

Other advisories for this package

electron has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-668: Exposure of Resource to Wrong Sphere) in other software:

Details

Severity MEDIUM
CVSS Score 6.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
CWE CWE-668
Public Exploit ✅ No
Source OSV
Published 2026-04-07
Updated 2026-08-20
Modified 2026-07-24
Fix URL N/A

Affected Packages

Software From version Fixed in
electron — —

Similar Threats

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