CVE-2026-70608Network attack vector

Unauthorized window creation via unchecked OpenURL navigation

Published Aug 5, 2026 · Updated Aug 5, 2026

Sandbox restriction bypass in affected Electron releases allows remote attackers to create windows through sandboxed iframe navigation. New-window navigations on the OpenURL path omit the iframe sandbox popup restriction, so an iframe without allow-popups can open a window or invoke setWindowOpenHandler. Exposure requires an app to embed untrusted content in such an iframe and to rely on that sandbox restriction rather than denying the request in its window-open handler.

CVSS severity7.2
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox restriction bypass in affected Electron releases allows remote attackers to create windows through sandboxed iframe navigation. New-window navigations on the OpenURL path omit the iframe sandbox popup restriction, so an iframe without allow-popups can open a window or invoke setWindowOpenHandler. Exposure requires an app to embed untrusted content in such an iframe and to rely on that sandbox restriction rather than denying the request in its window-open handler.

The record

CVE
CVE-2026-70608
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Electron
Product
Electron
Classifications
CWE-693, CWE-1021
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 39.8.10
  2. Affected versionversion=>= 40.0.0-alpha.1, < 41.10.3
  3. Affected versionversion=>= 42.0.0-alpha.1, < 42.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Electron · Electronversion=< 39.8.10; version=>= 40.0.0-alpha.1, < 41.10.3; version=>= 42.0.0-alpha.1, < 42.0.1

Published CVSS scores

7.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-1021Improper Restriction of Rendered UI Layers or Frames

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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