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CVE-2026-118177

unscored Deferred
NVD · CVE.org

When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted calendar locations pointing to other servers, local files or network shares. A malicious server, or a network attacker when the lookup used plain HTTP, could make Thunderbird subscribe to such a location. On Windows this could leak the user's NTLM credentials to an attacker-controlled host on every calendar refresh, and changes to the calendar could be written to the attacker's share or overwrite a local file. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.

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 4

  1. StatusPublished → DeferredNVD modified 2026-10-28 14:42
  2. StatusReceived → PublishedNVD modified 2026-10-27 18:27
  3. StatusPublished → ReceivedNVD modified 2026-10-27 19:17
  4. First seenunscored · mozillaNVD modified 2026-10-27 18:27

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3