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CVE-2026-118176

unscored Deferred
NVD · CVE.org

Thunderbird's check that prevents mailbox: URLs from accessing files on remote Windows network shares could be bypassed using extended-length UNC paths. Displaying a specially crafted email could cause Thunderbird to connect to an SMB server chosen by the attacker, disclosing the user's Windows account name and NTLM authentication data, which could be used for offline password cracking or relay attacks. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. 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