Vulnerability · Published May 14, 2025 · Assigned by mozilla
CVE-2025-3932Tracking Links in Attachments Bypassed Remote Content Blocking
Medium 6.5
In plain English
A medium-severity authentication bypass 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 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | thunderbird | 128.10.1-1.el10_0.alma.1 | ALSA-2025:8196 |
| AlmaLinux:8 | thunderbird | 128.11.0-1.el8_10.alma.1 | ALSA-2025:8756 |
| Debian:12 | thunderbird | 1:128.10.1esr-1~deb12u1 | DSA-5921-1 |
| Debian:12 | thunderbird | 1:128.10.1esr-1~deb12u1 | DEBIAN-CVE-2025-3932 |
| Debian:13 | thunderbird | 1:128.10.1esr-1 | DEBIAN-CVE-2025-3932 |
| Debian:14 | thunderbird | 1:128.10.1esr-1 | DEBIAN-CVE-2025-3932 |
| Rocky Linux:10 | thunderbird | 0:128.10.1-1.el10_0 | RLSA-2025:8196 |
| Rocky Linux:8 | thunderbird | 0:128.11.0-1.el8_10 | RLSA-2025:8756 |
| Rocky Linux:9 | thunderbird | 0:128.10.1-1.el9_6 | RLSA-2025:8203 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-3932 |
| 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-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N