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CVE-2026-118174

unscored Deferred
NVD · CVE.org

When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment's content to offer importing the key. A sender could mark the attachment as an external attachment pointing to an arbitrary URL, which Thunderbird then loaded without any user interaction, bypassing remote content blocking. On Windows, a URL pointing to an attacker-controlled network share could leak the user's NTLM credentials. The NTLM credential leak only affects Thunderbird on Windows. On other operating systems, the issue allowed a remote request that bypassed remote content blocking. 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