CVE-2025-3932

medium

Description

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 affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.

References

https://www.mozilla.org/security/advisories/mfsa2025-35/

https://www.mozilla.org/security/advisories/mfsa2025-34/

https://bugzilla.mozilla.org/show_bug.cgi?id=1960412

Details

Source: Mitre, NVD

Published: 2025-05-14

Updated: 2025-06-05

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Severity: Medium

EPSS

EPSS: 0.00017