CVE-2026-70604
Electron: Custom protocol with supportFetchAPI but not corsEnabled allows cross-origin reads
No known exploitation. EPSS puts it in the 28th percentile. Fixed in 39.8.10.
What to do
Find your product and version, then upgrade to the build on the right.
- ElectronAffected: < 39.8.10Upgrade to: not statedAffected: >= 40.0.0-alpha.1, < 40.9.3Upgrade to: not statedAffected: >= 41.0.0-alpha.1, < 41.4.0Upgrade to: not statedAffected: >= 42.0.0-alpha.1, < 42.0.0Upgrade to: not statedStated by: CVE record
- Electronjs ElectronAffected: < 39.8.10Upgrade to: 39.8.10Stated 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 39.8.10, 40.9.3, 41.4.0, and 42.0.0, a custom scheme registered with supportFetchAPI: true but without corsEnabled: true was not subject to CORS enforcement. A page loaded from a remote origin could therefore fetch() or XMLHttpRequest that scheme cross-origin and read the full response body, rather than the read being blocked. Apps that serve sensitive data from such a scheme and load remote or untrusted content in a renderer are affected. This issue is fixed in versions 39.8.10, 40.9.3, 41.4.0, and 42.0.0.
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
0.4% chance of exploitation activity in the next 30 days, which ranks it in the 28th 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:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Scored 7.4 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction RequiredA user must click a link, open a file, or perform some action
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 NoneNo integrity impact
- Availability NoneNo availability impact
Weaknesses
Sources
References in the record
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