Description
Encrypted S/MIME parts in a crafted multipart/alternative message can leak plaintext when included in a a HTML reply/forward. This vulnerability affects Thunderbird < 68.1 and Thunderbird < 60.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 68.1, unspecified – < 60.9 | 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 | thunderbird | 1:60.9.0-1 | — |
| Debian 13 | thunderbird | 1:60.9.0-1 | — |
| Debian 12 | thunderbird | 1:60.9.0-1 | — |
| Debian 10 | thunderbird | 1:60.9.0-1~deb10u1 | DSA-4523-1 |
| Debian 9 | thunderbird | 1:60.9.0-1~deb9u1 | DSA-4523-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | thunderbird | 1:60.9.0-1~deb8u1 | DLA-1926-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:60.9.0+build1-0ubuntu0.18.04.1 | USN-4150-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.9.0+build1-0ubuntu0.16.04.2 | USN-4150-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 60.9.0-2.el8_0 | RHSA-2019:2774 |
| RHEL 7 | thunderbird | 60.9.0-1.el7_7 | RHSA-2019:2773 |
| RHEL 6 | thunderbird | 60.9.0-1.el6_10 | RHSA-2019:2807 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
| SLES 15 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.1.1-lp151.2.13.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.1 | enigmail | 2.1.2-lp151.2.6.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 68.1.1-lp150.3.51.1 | openSUSE-SU-2019:2248-1 |
| openSUSE Leap 15.0 | enigmail | 2.1.2-lp150.34.1 | openSUSE-SU-2019:2248-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.9.0-1.amzn2.0.1 | ALAS2-2019-1304 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | thunderbird | 60.9.0-2.0.1.el8_0 | ELSA-2019-2774 |
| Oracle Linux 7 | thunderbird | 60.9.0-1.0.1.el7_7 | ELSA-2019-2773 |
Advisories 13
- RHSA-2019:2807 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:2773 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4150-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4523-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1926-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:2249-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2248-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2515-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2019:2774 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2019-1304 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 2, 2019
- ELSA-2019-2774 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 17, 2019
- ELSA-2019-2773 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 16, 2019