Description
An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. This vulnerability affects Firefox < 117, Firefox ESR < 115.4, and Thunderbird < 115.4.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 117 | 117 |
| Mozilla | Firefox ESR | unspecified – < 115.4 | 115.4 |
| Mozilla | Thunderbird | unspecified – < 115.4.1 | 115.4.1 |
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 | 115.4.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.4.1-1 | — |
| Debian 13 | firefox-esr | 115.4.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.4.1-1 | — |
| Debian 12 | firefox-esr | 115.4.0esr-1~deb12u1 | DSA-5535-1 |
| Debian 12 | thunderbird | 1:115.4.1-1~deb12u1 | DSA-5538-1 |
| Debian 11 | firefox-esr | 115.4.0esr-1~deb11u1 | DSA-5535-1 |
| Debian 11 | thunderbird | 1:115.4.1-1~deb11u1 | DSA-5538-1 |
| Debian 10 | firefox-esr | 115.4.0esr-1~deb10u1 | DLA-3632-1 |
| Debian 10 | thunderbird | 1:115.4.1-1~deb10u1 | DLA-3637-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu1 | — |
| Ubuntu 22.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu0.22.04.1 | USN-6468-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu0.20.04.1 | USN-6468-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 115.4.0-1.el9_2 | RHSA-2023:6188 |
| RHEL 9 | thunderbird | 115.4.1-1.el9_2 | RHSA-2023:6191 |
| RHEL 8 | firefox | 115.4.0-1.el8_8 | RHSA-2023:6187 |
| RHEL 8 | thunderbird | 115.4.1-1.el8_8 | RHSA-2023:6194 |
| RHEL 7 | firefox | 115.4.0-1.el7_9 | RHSA-2023:6162 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | firefox | 115.4.0-1.el9_0 | RHSA-2023:6199 |
| RHEL 8.6 EUS | firefox | 115.4.0-1.el8_6 | RHSA-2023:6186 |
| RHEL 8.6 EUS | thunderbird | 115.4.1-1.el8_6 | RHSA-2023:6195 |
| RHEL 8.4 TUS | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.4 E4S | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.4 AUS | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.2 TUS | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 TUS | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.2 E4S | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 E4S | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.2 AUS | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 AUS | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.1 E4S | firefox | 115.4.0-1.el8_1 | RHSA-2023:6189 |
| RHEL 8.1 E4S | thunderbird | 115.4.1-1.el8_1 | RHSA-2023:6198 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.4.0-1.el9_2.alma.1 | ALSA-2023:6188 |
| AlmaLinux 9 | thunderbird | 115.4.1-1.el9_2.alma | ALSA-2023:6191 |
| AlmaLinux 8 | firefox | 115.4.0-1.el8_8.alma.1 | ALSA-2023:6187 |
| AlmaLinux 8 | thunderbird | 115.4.1-1.el8_8.alma.1 | ALSA-2023:6194 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox | 115.4.0-1.el9_2 | RLSA-2023:6188 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| SLES 15 SP4 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES 15 SP4 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| SLES 15 SP3 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES 15 SP2 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES 15 SP1 | MozillaFirefox | 115.5.0-150000.150.116.1 | SUSE-SU-2023:4533-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.5.0-112.191.1 | SUSE-SU-2023:4532-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 115.5.0-150000.150.116.1 | SUSE-SU-2023:4533-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.5.0-112.191.1 | SUSE-SU-2023:4532-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 115.5.0-150000.150.116.1 | SUSE-SU-2023:4533-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 115.4.1-1.1 | openSUSE-SU-2024:13356-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 115.5.0-150200.152.117.1 | SUSE-SU-2023:4551-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.23 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.22 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.22 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.21 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.21 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.20 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.20 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.19 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.19 | thunderbird | 115.4.1-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 115.5.0-r0 | — |
| Alpine v3.18 | thunderbird | 115.4.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.4.1-1.amzn2.0.1 | ALAS2-2023-2334 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 115.4.0-1.0.1.el9_2 | ELSA-2023-6188 |
| Oracle Linux 9 | thunderbird | 115.4.1-1.0.1.el9_2 | ELSA-2023-6191 |
| Oracle Linux 8 | firefox | 115.4.0-1.0.1.el8_8 | ELSA-2023-6187 |
| Oracle Linux 8 | thunderbird | 115.4.1-1.0.1.el8_8 | ELSA-2023-6194 |
| Oracle Linux 7 | firefox | 115.4.0-1.0.1.el7_9 | ELSA-2023-6162 |
| Oracle Linux 7 | thunderbird | 115.4.1-1.0.1.el7_9 | ELSA-2023-6193 |
Advisories 36
- ALSA-2023:6188 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6191 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6187 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6194 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:6162 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6468-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RHSA-2023:6198 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6195 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6196 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6197 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6189 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6186 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6199 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6194 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6188 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6191 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6185 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6187 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5535-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5538-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3632-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3637-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:6188 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2023:4532-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4533-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4551-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13356-1 MozillaThunderbird-115.4.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4302-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2743 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- ALAS2-2023-2334 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 15, 2023
- ELSA-2023-6188 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6194 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6193 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6191 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6187 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 30, 2023
- ELSA-2023-6162 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 30, 2023
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1690979
- https://bugzilla.mozilla.org/show_bug.cgi?id=1836962
- https://lists.debian.org/debian-lts-announce/2023/10/msg00037.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00042.html
- https://www.debian.org/security/2023/dsa-5535
- https://www.debian.org/security/2023/dsa-5538
- https://www.mozilla.org/security/advisories/mfsa2023-34/
- https://www.mozilla.org/security/advisories/mfsa2023-46/
- https://www.mozilla.org/security/advisories/mfsa2023-47/