CVE-2025-0510: Address of e-mail sender can be spoofed by malicious email

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-04 · updated 2026-06-17
Weakness: CWE-345

Description

Thunderbird displayed an incorrect sender address if the From field of an email used the invalid group name syntax that is described in CVE-2024-49040. This vulnerability was fixed in Thunderbird 128.7 and Thunderbird 135.

Affected products

Mozilla Thunderbird: from 128.0.1 before 128.7.0; from 131.0 before 135.0 — fixed in 128.7.0, 135.0

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 128.7.0, 135.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1940570
https://www.mozilla.org/security/advisories/mfsa2025-10/
https://www.mozilla.org/security/advisories/mfsa2025-11/

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