CVE-2025-3523
Publication date 15 April 2025
Last updated 19 June 2026
Ubuntu priority
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 affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| thunderbird | ||
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Fixed 1:128.12.0+build1-0ubuntu0.22.04.1
|
|
| 20.04 LTS focal | Not in release |
Severity score breakdown
CVSS version: CVSS v3.0
Base score
6.4 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L
References
Related Ubuntu Security Notices (USN)
- USN-7663-1
- Thunderbird vulnerabilities
- 22 July 2025