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CVE-2026-113866

5.9 medium SSVC exploitation: none Awaiting Analysis
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 3

  1. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 17:36
  2. StatusReceived → PublishedNVD modified 2026-10-20 19:46
  3. First seenCVSS 5.9NVD modified 2026-10-20 20:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3