CVE & CISA-KEV Catalog

CVE-2026-3889

MEDIUM

6.5

CVSS v3

Description

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

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:140.9.0esr-1~deb11u1CVE-2026-3889

Fixed in:1:140.9.0esr-1~deb12u1CVE-2026-3889

Fixed in:1:140.9.0esr-1~deb13u1CVE-2026-3889

Fixed in:1:140.9.0esr-1CVE-2026-3889

thunderbirdRocky

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

thunderbirdRed Hat / RHEL

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

thunderbird-debuginfoRocky

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

thunderbird-debugsourceRocky

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289

Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287

Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286

Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290

Mozilla Thunderbird (en-US)Windows application

Affected:149.0Fixed in:149.0Mozilla

Affected:140.9.0Fixed in:140.9.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory2

Other references1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-451 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-38112	High	7.5	84%	KEV	Fix
CVE-2025-9491	High	7.8	63%	-	-
CVE-2024-43461	High	8.8	52%	KEV	Fix
CVE-2024-38197	Medium	6.5	16%	-	-
CVE-2026-21527	High	6.5	9.5%	-	Fix
CVE-2024-49040	High	7.5	7.7%	-	Fix

Embed a live status badge for CVE-2026-3889

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.