CVE-2026-3889 — User Interface (UI) Misrepresentation of Critical Information in Mozilla Thunderbird

CWE-451 — User Interface (UI) Misrepresentation of Critical InformationCWE-20 — Improper Input Validation10 documents9 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 92.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Mozilla Thunderbird
Timeline
PublishedMar 24

Description

Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NExploitability: 2.8 | Impact: 3.6

Affected Packages2 packages

▶NVDmozilla/thunderbird< 140.9.0+1
▶Debianmozilla/thunderbird< 1:140.9.0esr-1~deb11u1+3

🔴Vulnerability Details

3
CVEList
Spoofing issue in Thunderbird↗2026-03-24
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OSV
CVE-2026-3889: Spoofing issue in Thunderbird↗2026-03-24
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GHSA
GHSA-g3qh-qhp8-8f86: Spoofing issue in Thunderbird↗2026-03-24
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📋Vendor Advisories

4
Red Hat
thunderbird: Spoofing issue in Thunderbird↗2026-03-24
▶
Debian
CVE-2026-3889: thunderbird - Spoofing issue in Thunderbird. This vulnerability affects Thunderbird < 149 and ...↗2026
▶
Mozilla
Mozilla Foundation Security Advisory 2026-24: CVE-2026-3889↗
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Mozilla
Mozilla Foundation Security Advisory 2026-23: CVE-2026-3889↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-3889 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

1
Bugzilla
CVE-2026-3889 thunderbird: Spoofing issue in Thunderbird↗2026-03-24
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CVE-2026-3889 — Mozilla Thunderbird vulnerability | cvebase