What’s Vulnerable › Vulnerabilities
CVE-2026-70606: Electron: ProtocolResponse.url reuses the default session cache instead of the registering session
- Severity: medium (CVSS 5.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-05 · updated 2026-10-08
- Weakness: CWE-668
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.
Affected products
- electron: before 40.10.6; from 41.0.0 through 41.9.1; from 42.0.0 through 42.5.1; 43.0.0-alpha1, 43.0.0-alpha2, 43.0.0-alpha3, 43.0.0-alpha4, 43.0.0-alpha5 — fixed in 40.10.6
How to fix
Upgrade to a fixed version: electron 40.10.6. Check the vendor advisory for mitigations.
References
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