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
2026-07-29
AI Q&A
2026-03-24
EPSS Evaluated
2026-07-28
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)

Helpful Resources

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.

Attack-Flow Graph

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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.

Detection Guidance

I don't know

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

Mitigation Strategies

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