Electron up to 40.10.5/41.9.0/42.5.0 Custom Protocol information disclosure

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Electron up to 40.10.5/41.9.0/42.5.0. Affected is an unknown function of the component Custom Protocol Handler. This manipulation causes information disclosure. This vulnerability is registered as CVE-2026-70606. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in Electron up to 40.10.5/41.9.0/42.5.0 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Custom Protocol Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-70606 since 08/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 40.10.6, 41.9.1, 42.5.1 or 43.0.0 eliminates this vulnerability.

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Productinfo

Name

• Electron

Version

• 40.10.0
• 40.10.1
• 40.10.2
• 40.10.3
• 40.10.4
• 40.10.5
• 41.0
• 41.1
• 41.2
• 41.3
• 41.4
• 41.5
• 41.6
• 41.7
• 41.8
• 41.9.0
• 42.0
• 42.1
• 42.2
• 42.3
• 42.4
• 42.5.0

Website

• Product: https://github.com/electron/electron/

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