CVE-2026-126134
Feed subscriptions could leak NTLM credentials on Windows
Description
Thunderbird allowed feed subscriptions to file: URLs that point to a network share. If a user was tricked into subscribing to such a URL, Thunderbird connected to the attacker's server when fetching the feed. Windows then sent the user's NTLM credentials to that server. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160.
INFO
Published Date :
Nov. 10, 2026, 6:59 p.m.
Last Modified :
Nov. 10, 2026, 6:59 p.m.
Remotely Exploit :
No
Source :
mozilla
Solution
- Update Thunderbird to version 160 or later.
- Avoid subscribing to untrusted feed URLs.
- Educate users about phishing risks.
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