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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Thunderbird | affected |
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Tue, 27 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Matrix homeserver could redirect the chat session to a local file or network share | |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: mozilla
Published:
Updated: 2026-10-27T18:27:53.280Z
Reserved: 2026-10-27T18:16:33.089Z
Link: CVE-2026-118180
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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No weakness.