CVE-2021-39184: Electronjs Electron

High severity, CVSS 8.6. EPSS: 1.1% chance of exploitation in the next 30 days.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. A vulnerability in versions prior to 11.5.0, 12.1.0, and 13.3.0 allows a sandboxed renderer to request a "thumbnail" image of an arbitrary file on the user's system. The thumbnail can potentially include significant parts of the original file, including textual data in many cases. Versions 15.0.0-alpha.10, 14.0.0, 13.3.0, 12.1.0, and 11.5.0 all contain a fix for the vulnerability. Two workarounds aside from upgrading are available. One may make the vulnerability significantly more difficult for an attacker to exploit by enabling `contextIsolation` in one's app. One may also disable the functionality of the `createThumbnailFromPath` API if one does not need it.

Affected products

• Electronjs Electron: from 10.1.0, before 11.5.0 (fixed in 11.5.0); from 12.0.0, before 12.1.0 (fixed in 12.1.0); from 13.0.0, before 13.3.0 (fixed in 13.3.0); version 14.0.0 only; version 15.0.0 only

Published 2021-10-12. Last modified 2026-06-17.