Vulnerability in Electron
CVE-2026-70606
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 40.10.6, 41.9.1, 42.5.1, and 43.0.0, when a custom protocol handler returned a ProtocolResponse with a url and no session, Electron made the upstream request through defaultSession instead of the session that handled the protocol. A cached response could then be reused across otherwise isolated session partitions. Apps that use ProtocolResponse.url, omit ProtocolResponse.session, and rely on separate sessions to isolate content are affected. This issue is fixed in versions 40.10.6, 41.9.1, 42.5.1, and 43.0.0.
EPSS: 0.002 (5.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N.
Affected products
- Electron — versions >= 40.0.0-alpha.1, < 40.10.6, >= 41.0.0-alpha.1, < 41.9.1, >= 42.0.0-alpha.1, < 42.5.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-70606?
- CVE-2026-70606 is a medium-severity vulnerability in Electron, classified under Exposure of Resource to Wrong Sphere. CVSS score: 5.9/10. Published 2026-08-05.
- How severe is CVE-2026-70606?
- Medium severity. CVSS v3 base score is 5.9 out of 10.