Description
The error page for sites with invalid TLS certificates was missing the
activation-delay Firefox uses to protect prompts and permission dialogs
from attacks that exploit human response time delays. If a malicious
page elicited user clicks in precise locations immediately before
navigating to a site with a certificate error and made the renderer
extremely busy at the same time, it could create a gap between when
the error page was loaded and when the display actually refreshed.
With the right timing the elicited clicks could land in that gap and
activate the button that overrides the certificate error for that site. This vulnerability affects Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 102.12 | 102.12 |
| Mozilla | Firefox | unspecified – < 114 | 114 |
| Mozilla | Thunderbird | unspecified – < 102.12 | 102.12 |
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 | 102.12.0esr-1 | — |
| Debian 14 | thunderbird | 1:102.12.0-1 | — |
| Debian 13 | firefox-esr | 102.12.0esr-1 | — |
| Debian 13 | thunderbird | 1:102.12.0-1 | — |
| Debian 12 | firefox-esr | 102.12.0esr-1~deb12u1 | DSA-5421-1 |
| Debian 12 | thunderbird | 1:102.12.0-1~deb12u1 | DSA-5423-1 |
| Debian 11 | firefox-esr | 102.12.0esr-1~deb11u1 | DSA-5421-1 |
| Debian 11 | thunderbird | 1:102.12.0-1~deb11u1 | DSA-5423-1 |
| Debian 10 | firefox-esr | 102.12.0esr-1~deb10u1 | DLA-3448-1 |
| Debian 10 | thunderbird | 1:102.12.0-1~deb10u1 | DLA-3452-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | thunderbird | 1:102.13.0+build1-0ubuntu0.22.04.1 | USN-6214-1 |
| Ubuntu 20.04 LTS | firefox | 114.0+build3-0ubuntu0.20.04.1 | USN-6143-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:102.13.0+build1-0ubuntu0.20.04.1 | USN-6214-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +2 | 102.12.0-1.el9_2 | RHSA-2023:3589, RHSA-2023:3587 |
| RHEL 8 | firefox +1 | 102.12.0-1.el8_8 | RHSA-2023:3590, RHSA-2023:3588 |
| RHEL 7 | firefox +1 | 102.12.0-1.el7_9 | RHSA-2023:3579, RHSA-2023:3563 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | firefox +1 | 102.12.0-1.el9_0 | RHSA-2023:3567, RHSA-2023:3562 |
| RHEL 8.6 EUS | firefox +1 | 102.12.0-1.el8_6 | RHSA-2023:3566, RHSA-2023:3560 |
| RHEL 8.4 TUS | firefox +1 | 102.12.0-1.el8_4 | RHSA-2023:3597, RHSA-2023:3596 |
| RHEL 8.4 E4S | firefox +1 | 102.12.0-1.el8_4 | RHSA-2023:3597, RHSA-2023:3596 |
| RHEL 8.4 AUS | firefox +1 | 102.12.0-1.el8_4 | RHSA-2023:3597, RHSA-2023:3596 |
| RHEL 8.2 TUS | firefox +1 | 102.12.0-1.el8_2 | RHSA-2023:3578, RHSA-2023:3565 |
| RHEL 8.2 E4S | firefox +1 | 102.12.0-1.el8_2 | RHSA-2023:3578, RHSA-2023:3565 |
| RHEL 8.2 AUS | firefox +1 | 102.12.0-1.el8_2 | RHSA-2023:3578, RHSA-2023:3565 |
| RHEL 8.1 E4S | firefox +1 | 102.12.0-1.el8_1 | RHSA-2023:3564, RHSA-2023:3561 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +2 | 102.12.0-1.el9_2.alma | ALSA-2023:3589, ALSA-2023:3587 |
| AlmaLinux 8 | firefox +1 | 102.12.0-1.el8_8.alma | ALSA-2023:3590, ALSA-2023:3588 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | thunderbird | 102.12.0-1.el9_2 | RLSA-2023:3587 |
| Rocky Linux 8 | firefox +1 | 102.12.0-1.el8_8 | RLSA-2023:3590, RLSA-2023:3588 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES 15 SP5 | MozillaThunderbird | 102.12.0-150200.8.121.1 | SUSE-SU-2023:2612-1 |
| SLES 15 SP4 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES 15 SP4 | MozillaThunderbird | 102.12.0-150200.8.121.1 | SUSE-SU-2023:2612-1 |
| SLES 15 SP3 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES 15 SP2 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES 15 SP1 | MozillaFirefox | 102.12.0-150000.150.88.1 | SUSE-SU-2023:2440-1 |
Show 16 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SLES 12 SP4 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SLES 12 SP2 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 102.12.0-150000.150.88.1 | SUSE-SU-2023:2440-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SLE Real Time 15 SP3 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 102.12.0-150000.150.88.1 | SUSE-SU-2023:2440-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 102.12.0-112.162.1 | SUSE-SU-2023:2441-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 114.0.1-1.1 | openSUSE-SU-2024:12991-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 102.12.0-1.1 | openSUSE-SU-2024:12990-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 102.12.0-150200.8.121.1 | SUSE-SU-2023:2612-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 102.12.0-150200.152.90.1 | SUSE-SU-2023:2489-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 102.12.0-150200.8.121.1 | SUSE-SU-2023:2612-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 102.12.0-r0 | — |
| Alpine v3.22 | firefox-esr | 102.12.0-r0 | — |
| Alpine v3.21 | firefox-esr | 102.12.0-r0 | — |
| Alpine v3.20 | firefox-esr | 102.12.0-r0 | — |
| Alpine v3.19 | firefox-esr | 102.12.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 102.12.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +2 | 102.12.0-1.0.1.el9_2 | ELSA-2023-3589, ELSA-2023-3587 |
| Oracle Linux 8 | firefox +1 | 102.12.0-1.0.1.el8_8 | ELSA-2023-3590, ELSA-2023-3588 |
| Oracle Linux 7 | firefox +1 | 102.12.0-1.0.1.el7_9 | ELSA-2023-3579, ELSA-2023-3563 |
Advisories 45
- ALSA-2023:3587 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:3589 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:3588 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:3590 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2023-2031 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2023:3579 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:3563 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6214-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-6143-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5421-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5423-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3448-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3452-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:3587 Important: thunderbird security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:3588 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2023:3590 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:2489-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2441-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2440-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12991-1 MozillaFirefox-114.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2612-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12990-1 MozillaThunderbird-102.12.0-1.1 on GA media 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
- RHSA-2023:3597 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3596 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3590 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3588 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3589 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3587 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3578 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3567 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3565 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3566 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3564 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3561 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3562 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:3560 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-1414 Mozilla Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 27, 2024
- WID-SEC-2023-1385 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 7, 2024
- ELSA-2023-3587 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 17, 2023
- ELSA-2023-3589 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 17, 2023
- ELSA-2023-3590 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 15, 2023
- ELSA-2023-3588 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 15, 2023
- ELSA-2023-3579 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 14, 2023
- ELSA-2023-3563 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 12, 2023
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1695986
- https://www.mozilla.org/security/advisories/mfsa2023-19/
- https://www.mozilla.org/security/advisories/mfsa2023-20/
- https://www.mozilla.org/security/advisories/mfsa2023-21/
- https://security.gentoo.org/glsa/202312-03
- https://security.gentoo.org/glsa/202401-10