CVE-2026-118180

HighCVSS 7.5/10Last modified Nov 4, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-601

Affected software

VendorProductVersions
MozillaThunderbird—

References

Timeline

Published
Oct 27, 2026
Last modified
Nov 4, 2026
NVD status
Deferred

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CVE-2026-118180: High severity, CVSS 7.5 | Vulnix