CVE-2025-3932

Tracking Links in Attachments Bypassed Remote Content Blocking

CVSS 6.5 MEDIUMEPSS 0.3%CWE-288

It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

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

Productos afectados

Mozilla · Thunderbird

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Referencias

https://bugzilla.mozilla.org/show_bug.cgi?id=1960412 https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html https://www.mozilla.org/security/advisories/mfsa2025-34/https://www.mozilla.org/security/advisories/mfsa2025-35/