CVE-2025-3875

HIGH

Mozilla Thunderbird < 128.10.0 - Authentication Bypass by Spoofing

Title source: rule

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.

References (4)

[Mailing List] https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

[Permissions Required] https://bugzilla.mozilla.org/show_bug.cgi?id=1950629

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-34/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-35/

Scores

CVSS v3 7.5

EPSS 0.0037

EPSS Percentile 59.2%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-290

Status published

Products (3)

mozilla/thunderbird < 128.10.0

Mozilla/Thunderbird 128.10.1 - 128.*

Mozilla/Thunderbird 138.0.1

Published May 14, 2025

Tracked Since Feb 18, 2026