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CVE-2019-11747 The "Forget about this site" feature in the History pane is intended to remove all saved user data that indicates a user…
Description
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 site's HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 69 | earliest → < 69 | 69 |
| Firefox ESR 68.1 | earliest → < 68.1 | 68.1 |
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