CVE-2026-118174

published 2026-10-27

CVE-2026-118174: When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment's content to offer importing the key. A…

Priority P4 33

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
mozilla	thunderbird	< Thunderbird 153.6	Thunderbird 153.6
mozilla	thunderbird	< Thunderbird 159	Thunderbird 159

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