Medium severity · published Apr 3, 2026
CVE-2026-34778
Electron: Service worker can spoof executeJavaScript IPC replies
6.5
CVSS
0.1%
EPSS
No
On KEV
Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, a service worker running in a session could spoof reply messages on the internal IPC channel used by webContents.executeJavaScript() and related methods, causing the main-process promise to resolve with attacker-controlled data. Apps are only affected if they have service workers registered and use the result of webContents.executeJavaScript() (or webFrameMain.executeJavaScript()) in security-sensitive decisions. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
electron · electron
< 38.8.6; >= 39.0.0-alpha.1, < 39.8.1; >= 40.0.0-alpha.1, < 40.8.1; >= 41.0.0-alpha.1, < 41.0.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34778
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34778
Vendor Advisory
https://github.com/electron/electron/security/advisories/GHSA-xj5x-m3f3-5x3h
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