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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 69 | 69 |
| Mozilla | Firefox ESR | unspecified – < 68.1 | 68.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 68.1.0esr-1 | — |
| Debian 13 | firefox-esr | 68.1.0esr-1 | — |
| Debian 12 | firefox-esr | 68.1.0esr-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 69.0+build2-0ubuntu0.18.04.1 | USN-4122-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 16.04 LTS | firefox | 69.0+build2-0ubuntu0.16.04.4 | USN-4122-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 68.1.0-1.el8_0 | RHSA-2019:2663 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.1.0-3.54.2 | SUSE-SU-2019:2545-1 |
| SLES 15 SP1 | MozillaFirefox-branding-SLE | 68-4.8.5 | SUSE-SU-2019:2545-1 |
| SLES 15 | MozillaFirefox | 68.1.0-3.54.2 | SUSE-SU-2019:2545-1 |
| SLES 15 | MozillaFirefox-branding-SLE | 68-4.8.5 | SUSE-SU-2019:2545-1 |
| SLES 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP3 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP1 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 11 SP4 | MozillaFirefox | 68.2.0-78.51.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 68-21.9.8 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-atk | 2.26.1-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-cairo | 1.15.10-2.13.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gdk-pixbuf | 2.36.11-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-glib2 | 2.54.3-2.14.7 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gtk3 | 3.10.9-2.15.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-harfbuzz | 1.7.5-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi | 3.2.1.git259-2.3.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi-gcc5 | 5.3.1+r233831-14.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-pango | 1.40.14-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nspr | 4.21-29.6.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nss | 3.45-38.9.3 | SUSE-SU-2019:14246-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 68.1.0-lp151.2.14.1 | openSUSE-SU-2019:2251-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 68.1.0-lp150.3.66.1 | openSUSE-SU-2019:2260-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 68.1.0-1.0.1.el8_0 | ELSA-2019-2663 |
Advisories 10
- RHSA-2019:2663 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-4122-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2019:2260-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2251-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2545-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2620-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14246-1 Security update for Mozilla Firefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2019-2663 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 6, 2019