github.com
https://github.com/electron/electron CVE-2026-70606
MEDIUM
Electron: ProtocolResponse.url reuses the default session cache instead of the registering session
Record summary
CVE-2026-70606 has a selected CVSS score of 5.9 (medium).
Description
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 5, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
electronBrowse electron / electron | CVE List | >= 40.0.0-alpha.1, < 40.10.6 | affected |
| >= 41.0.0-alpha.1, < 41.9.1 | affected | ||
| >= 42.0.0-alpha.1, < 42.5.1 | affected | ||
| >= 43.0.0-alpha.1, < 43.0.0 | affected | ||
electronBrowse npm / electron | GitHub Advisory | 43.0.0-alpha.1 to < 43.0.0 · Fixed in 43.0.0 | affected |
| 42.0.0-alpha.1 to < 42.5.1 · Fixed in 42.5.1 | affected | ||
| 41.0.0-alpha.1 to < 41.9.1 · Fixed in 41.9.1 | affected | ||
| 40.0.0-alpha.1 to < 40.10.6 · Fixed in 40.10.6 | affected |
References
2github.comConfirmation
https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5