# CVE-2019-11747: Firefox ESR: The "Forget about this site" feature in the History pane is intended to remove all saved user data that…

CVE-2019-11747 is fixed in 4 products on 2 platforms, first by firefox 69.0+build2-0ubuntu0.18.04.1, released September 3, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-11747
- Priority: Routine
- CVSS: 6.5 (Important)
- EPSS: 0.0119
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 3, 2019
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-11747

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox ESR (en-US) | 78.0esr | [Mozilla Firefox ESR (en-US) 78.0esr](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-78.0esr.md) | Jun 25, 2020 |
| Linux | firefox RHEL 8 | 0:68.1.0-1.el8_0 | [RHSA-2019:2663](https://patchblox.com/security/data/fix/linux/rhsa-2019-2663.md) | Sep 4, 2019 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 69.0+build2-0ubuntu0.18.04.1 | [firefox 69.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-69.0-build2-0ubuntu0.18.04.1.md) | Sep 3, 2019 |
| Linux | firefox ol 8 | 0:68.1.0-1.0.1.el8_0 | [ELSA-2019-2663](https://patchblox.com/security/data/fix/linux/elsa-2019-2663.md) | Sep 6, 2019 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 69.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 69.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-69.0-build2-0ubuntu0.18.04.1.md) | Sep 3, 2019 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 69.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 69.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-69.0-build2-0ubuntu0.18.04.1.md) | Sep 3, 2019 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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