Description
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.
Affected products
electronjs: electron
References10
- github.com/electron/electron/security/advisories/GHSA-ff2p-hmqr… Vendor AdvisoryMitigation
- github.com/electron/electron/commit/17d5d26499cd279fab48f5f2652… Patch
- github.com/electron/electron/commit/23a6efb714dec80e2cf45d3054d… Patch
- github.com/electron/electron/commit/4ac50292d552fb510eb77839262… Patch
- github.com/electron/electron/commit/5b699544cbbed51bedb7c60d75c… Patch
- github.com/electron/electron/pull/51083 Issue TrackingPatch
- github.com/electron/electron/pull/51084 Issue TrackingPatch
- github.com/electron/electron/pull/51085 Issue TrackingPatch
- github.com/electron/electron/pull/51086 Issue TrackingPatch
- github.com/electron/electron/releases/tag/v39.8.9 Release Notes
Metrics
- CVSS 3.1
-
5.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 1% percentile: 47 · as of 13 November 2026
- CWE
- CWE-1321
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.