thunderbird: When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service...
CVE-2026-113866 is fixed in thunderbird on 1 platform, first by DEBIAN-CVE-2026-113866, released October 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| thunderbird · Debian 12.15 (bookworm) | 1:153.5.1esr-1~deb12u1 | DEBIAN-CVE-2026-113866 | Oct 27, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:153.5.1esr-1~deb13u1 | DEBIAN-CVE-2026-113866 | Oct 27, 2026 |
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