The Forget about this site feature in the History pane is intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the sites HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Firefox | Mozilla | * | 69.0 (excluding) |
Firefox_esr | Mozilla | * | 68.1.0 (excluding) |