vulnerability
Ubuntu: USN-7663-1 (CVE-2025-3523): Thunderbird vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:H/Au:N/C:P/I:C/A:P) | Apr 15, 2025 | Jul 23, 2025 | Apr 15, 2026 |
Severity
7
CVSS
(AV:N/AC:H/Au:N/C:P/I:C/A:P)
Published
Apr 15, 2025
Added
Jul 23, 2025
Modified
Apr 15, 2026
Description
When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hovering over any attachment. Although the correct link is used on click, the misleading hover text could trick users into downloading content from untrusted sources. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
Solution
ubuntu-upgrade-thunderbird
References
Rapid7 Labs
2026 Global Threat Landscape Report
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