CVE-2025-3932

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

14/05/2025

Last modified:

13/04/2026

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 was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x

6.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:mozilla:thunderbird::::::::		128.10.1 (excluding)
cpe:2.3:a:mozilla:thunderbird::::::::	129.0 (including)	138.0.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-3932

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools