Vulnerability · Published Apr 15, 2025 · Assigned by mozilla
CVE-2025-3523User Interface (UI) Misrepresentation of attachment URL
Medium 6.4
In plain English
A medium-severity security flaw in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux:8 | thunderbird | 128.9.2-1.el8_10.alma.1 | ALSA-2025:4649 |
| AlmaLinux:9 | thunderbird | 128.9.2-1.el9_5.alma.1 | ALSA-2025:4229 |
| AlmaLinux:9 | thunderbird | 128.10.0-1.el9_6.alma.1 | ALSA-2025:7435 |
| Debian:12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DSA-5912-1 |
| Debian:12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DEBIAN-CVE-2025-3523 |
| Debian:13 | thunderbird | 1:128.10.0esr-1 | DEBIAN-CVE-2025-3523 |
| Debian:14 | thunderbird | 1:128.10.0esr-1 | DEBIAN-CVE-2025-3523 |
| Rocky Linux:9 | thunderbird | 0:128.10.0-1.el9_5 | RLSA-2025:7435 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-3523 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | see references |
Weakness: CWE-451 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L