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CVE-2026-118178

unscored Deferred
NVD · CVE.org

A remote RSS feed could use the itunes:new-feed-url or newLocation element to permanently change its stored subscription URL to a file: URL. Thunderbird then read that location on every feed update. This allowed a malicious feed, or an attacker able to modify a feed delivered over HTTP, to make Thunderbird read local files and, on Windows, connect to an attacker-controlled network share, which could leak the user's NTLM credentials. The NTLM credential leak only affects Thunderbird on Windows. Other operating systems are affected by the local file read only. 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