CVE-2026-34777: Electron: Incorrect origin passed to permission request handler for iframe requests
Impact When an iframe requests fullscreen, pointerLock, keyboardLock, openExternal, or media permissions, the origin passed to session.setPermissionRequestHandler() was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or webContents.getURL() may inadvertently grant permissions to embedded third-party content.
The correct requesting URL remains available via details.requestingUrl. Apps that already check details.requestingUrl are not affected.
Workarounds In your setPermissionRequestHandler, inspect details.requestingUrl rather than the origin parameter or webContents.getURL() when deciding whether to grant fullscreen, pointerLock, keyboardLock, openExternal, or media permissions.
Fixed Versions 41.0.0 40.8.1 39.8.1 38.8.6
For more information If there are any questions or comments about this advisory, please email security@electronjs.org
Other sources
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, when an iframe requests fullscreen, pointerLock, keyboardLock, openExternal, or media permissions, the origin passed to session.setPermissionRequestHandler() was the top-level page's origin rather than the requesting iframe's origin. Apps that grant permissions based on the origin parameter or webContents.getURL() may inadvertently grant permissions to embedded third-party content. The correct requesting URL remains available via details.requestingUrl. Apps that already check details.requestingUrl are not affected. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 41.0.0 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 40.8.1 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 39.8.1 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 38.8.6 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 38.8.6 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 39.8.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 40.8.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 41.0.0 - Configuration
In setPermissionRequestHandler, when deciding whether to grant fullscreen, pointerLock, keyboardLock, openExternal, or media permissions, inspect details.requestingUrl instead of the origin parameter or webContents.getURL().
Electron setPermissionRequestHandler Use details.requestingUrl for permission decisions = Inspect details.requestingUrl rather than origin parameter or webContents.getURL()