CVE-2025-3932

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1960412	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-34/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-35/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:thunderbird::::::::
	cpe:2.3:a:mozilla:thunderbird::::::::

History

05 Jun 2025, 14:26

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-05-14 17:15

Updated : 2025-06-05 14:26

NVD link : CVE-2025-3932

Mitre link : CVE-2025-3932

CVE.ORG link : CVE-2025-3932

JSON object : View

Products Affected

mozilla

thunderbird

CWE

CWE-288

Authentication Bypass Using an Alternate Path or Channel

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