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CVE PROGRAM SOURCE RECORD5.9 Medium

CVE-2026-113866

Account password sent unencrypted during Exchange account setup

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Status
Published
Published
Updated
Assigning organization
mozilla

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Thunderbird

  • 153.5.1 to ≤ 153.*unaffected
  • 158.0.1 to ≤ *unaffected

References