vulnerability
MFSA2025-35 Thunderbird: Security Vulnerabilities fixed in Thunderbird 138.0.1 (CVE-2025-3875)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:C/I:N/A:N) | May 13, 2025 | May 15, 2025 | Jun 7, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:C/I:N/A:N)
Published
May 13, 2025
Added
May 15, 2025
Modified
Jun 7, 2026
Description
Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address to be used. For example, if the From header contains an (invalid) value "Spoofed Name ", Thunderbird treats [email protected] as the actual address. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.
Solution
mozilla-thunderbird-upgrade-138_0_1
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.