MEDIUM 5.4 GitHub
CVE-2026-70610
Electron: contextBridge object copy honors prototype setters
### Impact
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. Apps that only accept primitive arguments, or that validate object arguments, are not affected.
### Workaroun
Affected Products
- npm/electron < 39.8.9
- npm/electron >= 40.0.0-alpha.1, < 40.9.2
- npm/electron >= 41.0.0-alpha.1, < 41.2.2
- npm/electron >= 42.0.0-alpha.1, < 42.0.0-beta.4
References
- https://github.com/advisories/GHSA-ff2p-hmqr-hxm4
- https://github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr-hxm4
- https://github.com/electron/electron/pull/51083
- https://github.com/electron/electron/pull/51084
This medium severity vulnerability with a CVSS score of 5.4 was published on 2026-08-05 via GitHub. Affected: npm/electron < 39.8.9, npm/electron >= 40.0.0-alpha.1, < 40.9.2, npm/electron >= 41.0.0-alpha.1, < 41.2.2 and 1 more.
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