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EUVD-2026-233437

2026-10-09T08:02:38.509215+00:00

EUVD-2026-233437

fkie_cve-2022-36077

2026-10-09T08:02:38.509255+00:00

The Electron framework enables writing cross-platform desktop applications using JavaScript, HTML and CSS. In versions prior to 21.0.0-beta.1, 20.0.1, 19.0.11, and 18.3.7, Electron is vulnerable to Exposure of Sensitive Information. When following a redirect, Electron delays a check for redirecting to file:// URLs from other schemes. The contents of the file is not available to the renderer following the redirect, but if the redirect target is a SMB URL such as `file://some.website.com/`, then in some cases, Windows will connect to that server and attempt NTLM authentication, which can include sending hashed credentials.This issue has been patched in versions: 21.0.0-beta.1, 20.0.1, 19.0.11, and 18.3.7. Users are recommended to upgrade to the latest stable version of Electron. If upgrading isn't possible, this issue can be addressed without upgrading by preventing redirects to file:// URLs in the `WebContents.on('will-redirect')` event, for all WebContents as a workaround.

GHSA-p2jh-44qj-pf2v — Exfiltration of hashed SMB credentials on Windows via file:// redirect

2026-10-09T08:02:38.509295+00:00

Affected: npm: electron

### Impact When following a redirect, Electron delays a check for redirecting to file:// URLs from other schemes. The contents of the file is not available to the renderer following the redirect, but if the redirect target is a SMB URL such as `file://some.website.com/`, then in some cases, Windows will connect to that server and attempt NTLM authentication, which can include sending hashed credentials.

### Patches This issue has been fixed in all current stable versions of Electron. Specifically, these versions contain the fixes:

- 21.0.0-beta.1 - 20.0.1 - 19.0.11 - 18.3.7

We recommend all apps upgrade to the latest stable version of Electron.

### Workarounds If upgrading isn't possible, this issue can be addressed without upgrading by preventing redirects to file:// URLs in the `WebContents.on('will-redirect')` event, for all WebContents:

```js app.on('web-contents-created', (e, webContents) => { webContents.on('will-redirect', (e, url) => { if (/^file:/.test(url)) e.preventDefault() }) }) ```

### For more information If you have any questions or comments about this advisory, email us at [security@electronjs.org](mailto:security@electronjs.org).

### Credit Thanks to user @coolcoolnoworries for reporting this issue.

gsd-2022-36077

2026-10-09T08:02:38.509343+00:00

gsd-2022-36077