More information about this CVE will likely be available in a few days
Description
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.
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Information
Source identifier
Vulnerability status
Deferred
Published
2026-10-27T19:17:29.260Z
21 hours agoLast modified
2026-10-28T14:42:32.260Z
1 hour ago