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Mozilla CVE-2026-3889

| EUVDEUVD-2026-15019 MEDIUM
User Interface (UI) Misrepresentation of Critical Information (CWE-451)
2026-03-24 mozilla
Information Disclosure Mozilla Red Hat Suse
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.4 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
149,140.9
EUVD ID Assigned
Mar 24, 2026 - 20:31 euvd
EUVD-2026-15019
Analysis Generated
Mar 24, 2026 - 20:31 vuln.today
CVE Published
Mar 24, 2026 - 20:27 nvd
MEDIUM 6.5

DescriptionCVE.org

Spoofing issue in Thunderbird. This vulnerability affects Thunderbird < 149 and Thunderbird < 140.9.

AnalysisAI

A spoofing vulnerability exists in Mozilla Thunderbird that affects versions below 149 and below 140.9, allowing attackers to spoof email sources or identities. This vulnerability is classified as an information disclosure issue that could compromise email authentication and user trust. While specific CVSS and EPSS metrics are unavailable, the vulnerability warrants prompt patching as Mozilla has issued security advisories indicating active remediation efforts.

Technical ContextAI

This vulnerability affects Mozilla Thunderbird email client across multiple versions (CPE: cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*). The spoofing issue likely relates to improper validation of email headers, sender information, or cryptographic signatures—common attack vectors in email clients where inadequate verification of message origin allows threat actors to impersonate legitimate senders. While no explicit CWE is provided, spoofing vulnerabilities typically fall under CWE-287 (Improper Authentication) or CWE-347 (Improper Verification of Cryptographic Signature). The vulnerability was identified and tracked in Mozilla's bug system (bugzilla.mozilla.org bug #2020723) before public disclosure.

RemediationAI

Upgrade Mozilla Thunderbird to version 149 or later, or to version 140.9 or later if remaining on the 140.x branch. These patched versions address the spoofing vulnerability and restore proper email source validation. Users should visit https://www.mozilla.org/security/advisories/mfsa2026-23/ or https://www.mozilla.org/security/advisories/mfsa2026-24/ to download the latest release or enable automatic updates. Until patching is possible in constrained environments, users should exercise heightened caution when verifying sender identity through out-of-band communication (e.g., phone calls to confirm unexpected requests) and avoid clicking links or opening attachments from suspicious or unexpected senders, though this is a weak workaround and not a substitute for applying the security patch.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 SUSE Linux Enterprise Workstation Extension 15 SP7 Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7 Fixed

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CVE-2026-3889 vulnerability details – vuln.today
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