Unpreventable top-level navigation

Impact

The will-navigate event that apps use to prevent navigations to unexpected destinations as per our security recommendations can be bypassed when a sub-frame performs a top-frame navigation across sites.

Patches

• 11.0.0-beta.1
• 10.0.1
• 9.3.0
• 8.5.1

Workarounds

Sandbox all your iframes using the sandbox attribute. This will prevent them creating top-frame navigations and is good practice anyway.

For more information

If you have any questions or comments about this advisory:

• Email us at [email protected]