CVE-2026-34777
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In Electron 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 may inadvertently grant permissions to embedded third-party content.
Risk Assessment
Applications using session.setPermissionRequestHandler() or webContents.getURL() for permission decisions may accidentally grant permissions to malicious embedded iframe content, potentially leading to security breaches.
Recommendation
Update Electron to version 38.8.6, 39.8.1, 40.8.1, or 41.0.0. Also verify that the application uses details.requestingUrl instead of the origin from getURL() for permission verification.
Original NVD description (English source)
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.