PT-2026-118618
CVE-2026-113866
·
Published
2026-10-20
·
Updated
2026-10-22
Description by
CVSS 3.1
5.9
MediumMetricsAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Name of the Vulnerable Software and Affected Versions
Thunderbird versions prior to 153.5.1
Thunderbird versions prior to 158.0.1
Description
During account setup, the Exchange AutoDiscover lookup sends an unencrypted request over plain HTTP to the domain's AutoDiscover service. A bug causes this request to include the user's entered credentials, which allows a network attacker to intercept and obtain the user's password.
Recommendations
Update to version 153.5.1.
Update to version 158.0.1.
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