More information about this CVE will likely be available in a few days

Description


When logging in to a Matrix account, Thunderbird used the homeserver address provided in the server's login response without validating it. A malicious or compromised homeserver could provide a file: URL, causing Thunderbird to send all further Matrix requests of that session to local files or, on Windows, 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 unaffected. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.

Related CPE's


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Weaknesses


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CVSS impact metrics


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Information


Source identifier

[email protected]

Vulnerability status

Deferred

Published

2026-10-27T19:17:29.693Z

21 hours ago

Last modified

2026-10-28T14:42:32.260Z

1 hour ago