Description
It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | — | 128.10.1 |
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 | thunderbird | 1:128.10.1esr-1 | — |
| Debian 13 | thunderbird | 1:128.10.1esr-1 | — |
| Debian 12 | thunderbird | 1:128.10.1esr-1~deb12u1 | DSA-5921-1 |
| Debian 11 | thunderbird | 1:128.10.1esr-1~deb11u1 | DLA-4167-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | thunderbird | 128.10.1-1.el10_0 | RHSA-2025:8196 |
| RHEL 9 | thunderbird | 128.10.1-1.el9_6 | RHSA-2025:8203 |
| RHEL 8 | thunderbird | 128.11.0-1.el8_10 | RHSA-2025:8756 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | thunderbird | 128.10.1-1.el9_4 | RHSA-2025:8325 |
| RHEL 9.2 EUS | thunderbird | 128.10.1-1.el9_2 | RHSA-2025:8326 |
| RHEL 9.0 E4S | thunderbird | 128.10.1-1.el9_0 | RHSA-2025:8324 |
| RHEL 8.8 TUS | thunderbird | 128.10.1-1.el8_8 | RHSA-2025:8784 |
| RHEL 8.8 E4S | thunderbird | 128.10.1-1.el8_8 | RHSA-2025:8784 |
| RHEL 8.6 TUS | thunderbird | 128.10.1-1.el8_6 | RHSA-2025:8594 |
| RHEL 8.6 E4S | thunderbird | 128.10.1-1.el8_6 | RHSA-2025:8594 |
| RHEL 8.6 AUS | thunderbird | 128.10.1-1.el8_6 | RHSA-2025:8594 |
| RHEL 8.4 AUS | thunderbird | 128.10.1-1.el8_4 | RHSA-2025:8507 |
| RHEL 8.2 AUS | thunderbird | 128.10.1-1.el8_2 | RHSA-2025:8391 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | thunderbird | 128.10.1-1.el10_0.alma.1 | ALSA-2025:8196 |
| AlmaLinux 8 | thunderbird | 128.11.0-1.el8_10.alma.1 | ALSA-2025:8756 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | thunderbird | 128.10.1-1.el10_0 | RLSA-2025:8196 |
| Rocky Linux 9 | thunderbird | 128.10.1-1.el9_6 | RLSA-2025:8203 |
| Rocky Linux 8 | thunderbird | 128.11.0-1.el8_10 | RLSA-2025:8756 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaThunderbird | 128.10.1-150200.8.215.1 | SUSE-SU-2025:01660-2 |
| SLES 15 SP6 | MozillaThunderbird | 128.10.1-150200.8.215.1 | SUSE-SU-2025:01660-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 128.10.1-1.1 | openSUSE-SU-2025:15131-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.10.1-150200.8.215.1 | SUSE-SU-2025:01660-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 128.10.1-1.amzn2.0.1 | ALAS2-2025-2859 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | thunderbird | 128.11.0-1.0.1.el10_0 | ELSA-2025-8196 |
| Oracle Linux 9 | thunderbird | 128.10.1-1.0.1.el9_6 | ELSA-2025-8203 |
| Oracle Linux 8 | thunderbird | 128.11.0-1.0.1.el8_10 | ELSA-2025-8756 |
Advisories 27
- ALSA-2025:8196 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8756 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:8784 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8594 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8756 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8325 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8326 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8203 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8324 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8196 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8507 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8391 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:01660-2 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5921-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4167-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:15131-1 MozillaThunderbird-128.10.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 5, 2026
- SUSE-SU-2025:01660-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- RLSA-2025:8196 Important: thunderbird security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:8203 Important: thunderbird security update Rocky Linux Security Advisories · Oct 4, 2025
- RLSA-2025:8756 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- WID-SEC-2025-1062 Mozilla Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2025
- ELSA-2025-8196 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ALAS2-2025-2859 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 24, 2025
- ELSA-2025-8756 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 10, 2025
- ELSA-2025-8203 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 27, 2025