Electron: DevTools JavaScript Injection via Unsanitized Dock State Parameter

### Impact The `mode` option of `webContents.openDevTools()` was not sanitized before use by the DevTools frontend. If an attacker can influence this value, script under their control may run in the DevTools context, which in unsandboxed configurations has access to Node.js. Apps are only affected if untrusted input can reach the `mode` argument of `openDevTools()`, or if untrusted content can call `openDevTools()` on a `<webview>` it embeds. Apps that only ever pass a fixed dock mode are not affected. ### Workarounds Only pass fixed, allowlisted values (`right`, `bottom`, `undocked`, `detach`) as the DevTools `mode`, and do not expose `openDevTools` to untrusted content. ### Fixed Versions * `42.0.0-beta.1` * `41.2.0` * `40.9.0` * `39.8.7` ### For more information If you have any questions or comments about this advisory, email Electron at [[email protected]](mailto:[email protected])

Source published

5 Aug 2026 17:32:47 UTC

Source modified

20 Aug 2026 05:15:07 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

Publisher rating · MODERATE