CVE-2026-34777
MEDIUM
GHSA-r5p7-gp4j-qhrx
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
3Description
### 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 [[email protected]](mailto:[email protected])
Analysis
Electron versions prior to 38.8.6, 39.8.1, 40.8.1, and 41.0.0 pass the top-level page origin instead of the requesting iframe's origin to permission request handlers for fullscreen, pointerLock, keyboardLock, openExternal, and media permissions, allowing attackers to trick applications into granting sensitive permissions to embedded third-party content via social engineering or malicious iframe injection. Unauthenticated remote attackers can exploit this via user interaction (iframe load), with CVSS 5.4 indicating moderate confidentiality and integrity impact; no public exploit code or active exploitation confirmed at time of analysis.
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