CVE-2025-3932
Tracking Links in Attachments Bypassed Remote Content Blocking
- State
- Published
- Severity
- 6.5 Medium
- Published
- May 14, 2025
- Updated
- Apr 13, 2026
- Reserved
- Apr 25, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-288 Authentication Bypass Using an Alternate Path or Channel
Affected Products
| Product | Versions |
|---|---|
ThunderbirdMozilla |
|
References
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