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CVE-2026-70612

Electron: Sandboxed iframes can launch external protocol handlers

No known exploitation. EPSS puts it in the 36th percentile. Fixed in 39.8.8.

CVSS 3.15.4MediumEPSS percentile36th0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix39.8.8Upgrade to this build

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • ElectronAffected: < 39.8.8Upgrade to: not statedAffected: >= 40.0.0-alpha.1, < 40.9.0Upgrade to: not statedAffected: >= 41.0.0-alpha.1, < 41.2.1Upgrade to: not statedAffected: >= 42.0.0-alpha.1, < 42.0.0-beta.3Upgrade to: not statedStated by: CVE record
  • Electronjs ElectronAffected: < 39.8.8Upgrade to: 39.8.8Stated by: NVD

Versions as the sources state them. Full version matrix after sign-in

What it is

From the CVE record

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3, requests to open external protocol URLs from web content did not take iframe sandbox restrictions into account, so a sandboxed iframe could cause an OS-registered external application to be launched. The frame sandbox state was also not made available to the app permission handlers, affecting apps that render untrusted content in sandboxed iframes and grant the openExternal permission by default when no setPermissionRequestHandler is installed. This issue is fixed in 39.8.8, 40.9.0, 41.2.1, and 42.0.0-beta.3.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS36th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 36th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

7 events over 64 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Record updated
  3. Publishedweakness classified, record updated, record updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Scored 5.4 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)

Impact if exploited

  • Confidentiality LowSome restricted information is disclosed, but limited in scope
  • Integrity LowData modification is possible but limited in scope or consequence
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

And 10 more references. See all after sign-in

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