CVE-2025-3932

thunderbird: Tracking Links in Attachments Bypassed Remote Content Blocking

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Severity

Low

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · May 15, 2025

Updated · June 28, 2026

Description

The Mozilla Foundation's Security Advisory describes the following issue: It is possible to craft an email that shows a tracking link as an attachment. If the user attempts to open the attachment, Thunderbird automatically accesses the link. The configuration to block remote content does 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.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CWE-288 · Authentication Bypass Using an Alternate Path or Channel