Vulnerability Monitor

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CVE-2025-3875

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 affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.

Published

2025-05-14T17:15:48.470

Last Modified

2025-06-05T14:27:05.837

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

Weaknesses

Type: Secondary
CWE-290

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	thunderbird	< 128.10.0	Yes
Application	mozilla	thunderbird	< 138.0.1	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1950629 Permissions Required ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-34/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-35/ Vendor Advisory ([email protected])