CVE-2026-70606

Electron: ProtocolResponse.url reuses the default session cache instead of the registering session

State: Published
Severity: 5.9 Medium
Published: Aug 5, 2026
Updated: Aug 5, 2026
Reserved: Aug 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-668 Exposure of Resource to Wrong Sphere

Affected Products

Product	Versions
electronelectron	>= 40.0.0-alpha.1, < 40.10.6Affected >= 41.0.0-alpha.1, < 41.9.1Affected >= 42.0.0-alpha.1, < 42.5.1Affected >= 43.0.0-alpha.1, < 43.0.0Affected

References

https://github.com/electron/electron/security/advisories/GHSA-r4w5-6pfg-jxp5

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