Description
dDecrypted S/MIME parts hidden with CSS or the plaintext HTML tag can leak plaintext when included in a HTML reply/forward. This vulnerability affects Thunderbird < 52.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 52.9 | 52.9 |
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 | 1:52.9.0-1 | — |
| Debian 13 | thunderbird | 1:52.9.0-1 | — |
| Debian 12 | thunderbird | 1:52.9.0-1 | — |
| Debian 9 | thunderbird | 1:52.9.1-1~deb9u1 | DSA-4244-1 |
| Debian 8 | thunderbird | 1:52.9.1-1~deb8u1 | DLA-1425-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:52.9.1+build3-0ubuntu0.18.04.1 | USN-3714-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.9.1+build3-0ubuntu0.16.04.1 | USN-3714-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.9.1+build3-0ubuntu0.14.04.1 | USN-3714-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | thunderbird | 52.9.1-1.el7_5 | RHSA-2018:2252 |
| RHEL 6 | thunderbird | 52.9.1-1.el6 | RHSA-2018:2251 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaThunderbird | 52.9.1-3.7.1 | SUSE-SU-2018:2174-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 52.9.1-1.amzn2 | ALAS2-2018-1061 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | thunderbird | 52.9.1-1.0.1.el7_5 | ELSA-2018-2252 |
Advisories 9
- RHSA-2018:2252 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2018:2251 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3714-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4244-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1425-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:2174-1 Security update for Mozilla Thunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2018-1061 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 21, 2018
- ELSA-2018-2252 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 24, 2018
References
- 104613 vdb-entry
- GLSA-201811-13 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-18/
- DSA-4244 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1464056
- https://bugzilla.mozilla.org/show_bug.cgi?id=1464667
- RHSA-2018:2252 vendor-advisory
- [debian-lts-announce] 20180714 [SECURITY] [DLA 1425-1] thunderbird security update mailing-list
- RHSA-2018:2251 vendor-advisory
- USN-3714-1 vendor-advisory