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 was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Mozilla Thunderbird
PublishedMay 14, 2025
First seenMay 14, 2025
Weakness typeCWE-288CWE-288
How to fix
Update
- mozilla thunderbird128.10.1, 138.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla thunderbird | v < 128.10.1, 129.0 ≤ v < 138.0.1 | 128.10.1, 138.0.1 |
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