CVE-2026-70602
Electron: Extension tab APIs operate across session boundaries
No known exploitation. EPSS puts it in the 16th percentile. Fixed in 39.8.8.
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, extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session. Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. This issue is fixed in versions 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.
- 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
0.3% chance of exploitation activity in the next 30 days, which ranks it in the 16th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
6 events over 64 days, from the signal feeds we watch.
- Patch availablerecord updated
- Record updated
- Publishedweakness classified, record updated
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:N
Scored 6.6 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 HighRequires admin or elevated privileges
- 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 HighTotal information disclosure — all data in the component is compromised
- Integrity LowData modification is possible but limited in scope or consequence
- Availability NoneNo availability impact
Weaknesses
Sources
References in the record
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