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CVE-2026-3889

MEDIUM CVSS 3.1: 6.5 EPSS 0.02%
Updated Mar 27, 2026
Thunderbird
Parameter Value
CVSS 6.5 (MEDIUM)
Affected Versions before 149.0
Fixed In 140.9.0
Type CWE-451
Vendor Thunderbird
Public PoC No

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

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
None
No data leak
Integrity
High
Complete data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Mozilla Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
140.9.0
Mozilla Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
149.0

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