CVE-2026-3889
Received Received - Intake
Spoofing Vulnerability in Thunderbird Versions Below

Publication date: 2026-03-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
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Meta Information
Published
2026-03-24
Last Modified
2026-04-13
Generated
2026-06-19
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-18
NVD
CVE-2026-3889
EUVD
EUVD-2026-15019
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla thunderbird to 149.0 (exc)
mozilla thunderbird to 140.9.0 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-451 The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.
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Executive Summary

This vulnerability is a spoofing issue found in Mozilla Thunderbird versions earlier than 149 and earlier than 140.9.

Impact Analysis

The vulnerability could allow an attacker to spoof information in Thunderbird, potentially misleading users by falsifying sender or message details.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

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