CVE-2026-70602Network attack vector

Cross-session window access via unscoped extension APIs

Published Aug 5, 2026 · Updated Aug 5, 2026

Improper access control in Electron allows attackers controlling a loaded extension to read and modify windows across isolated sessions. The tab and scripting APIs resolve windows without restricting targets to the extension's own session, enabling cross-session navigation, script execution, and content reads. Exposure requires an app to load Chrome extensions with session.loadExtension and depend on separate Electron sessions as a security boundary.

CVSS severity6.6
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Electron allows attackers controlling a loaded extension to read and modify windows across isolated sessions. The tab and scripting APIs resolve windows without restricting targets to the extension's own session, enabling cross-session navigation, script execution, and content reads. Exposure requires an app to load Chrome extensions with session.loadExtension and depend on separate Electron sessions as a security boundary.

The record

CVE
CVE-2026-70602
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Electron
Product
Electron
Classifications
CWE-284, T1059.007
Attack vector
network
Privileges
Unavailable

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 39.8.8
  2. Affected versionversion=>= 40.0.0-alpha.1, < 40.9.0
  3. Affected versionversion=>= 41.0.0-alpha.1, < 41.2.1
  4. Affected versionversion=>= 42.0.0-alpha.1, < 42.0.0-beta.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Electron · Electronversion=< 39.8.8; version=>= 40.0.0-alpha.1, < 40.9.0; version=>= 41.0.0-alpha.1, < 41.2.1; version=>= 42.0.0-alpha.1, < 42.0.0-beta.3

Published CVSS scores

6.6GitHubCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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