Description
If an attacker intercepts Thunderbird's initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 68.10.0 | 68.10.0 |
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 | 1:68.10.0-1 | — |
| Debian 13 | thunderbird | 1:68.10.0-1 | — |
| Debian 12 | thunderbird | 1:68.10.0-1 | — |
| Debian 10 | thunderbird | 1:68.10.0-1~deb10u1 | DSA-4718-1 |
| Debian 9 | thunderbird | 1:68.10.0-1~deb9u1 | DSA-4718-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.20.04.1 | — |
| Ubuntu 18.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.18.04.1 | — |
| Ubuntu 16.04 LTS | thunderbird | 1:68.10.0+build1-0ubuntu0.16.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 68.10.0-1.el8_2 | RHSA-2020:3038 |
| RHEL 7 | thunderbird | 68.10.0-1.el7_8 | RHSA-2020:2906 |
| RHEL 6 | thunderbird | 68.10.0-1.el6_10 | RHSA-2020:2966 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.1 EUS | thunderbird | 68.10.0-1.el8_1 | RHSA-2020:2907 |
| RHEL 8.0 E4S | thunderbird | 68.10.0-1.el8_0 | RHSA-2020:3046 |
Advisories 6
- RHSA-2020:2966 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:2906 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-4718-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2020:3046 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:3038 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:2907 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025