Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.3 contextBridge prototype pollution

Summaryinfo

A vulnerability, which was classified as critical, was found in Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.3. This issue affects some unknown processing of the component contextBridge. The manipulation results in prototype pollution. This vulnerability is identified as CVE-2026-70610. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Electron up to 39.8.8/40.9.1/41.2.1/42.0.0-beta.3. Affected is some unknown functionality of the component contextBridge. The manipulation with an unknown input leads to a prototype pollution vulnerability. CWE is classifying the issue as CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4, objects copied across the contextBridge boundary from untrusted content could carry an attacker-influenced prototype, enabling prototype-pollution-style attacks against preload code despite context isolation being enabled. Apps are only affected if their preload code accepts object arguments from untrusted content and reads properties from them without own-property checks, while apps that only accept primitive arguments or validate object arguments are not affected. This issue is fixed in 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-70610 since 08/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 39.8.9, 40.9.2, 41.2.2 or 42.0.0-beta.4 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Electron

Version

• 39.8.0
• 39.8.1
• 39.8.2
• 39.8.3
• 39.8.4
• 39.8.5
• 39.8.6
• 39.8.7
• 39.8.8
• 40.9.0
• 40.9.1
• 41.2.0
• 41.2.1
• 42.0.0-beta.0
• 42.0.0-beta.1
• 42.0.0-beta.2
• 42.0.0-beta.3

Website

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

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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