CVE-2026-3889
6.5
MEDIUM
CVSS 3.1
EPSS 0.03%
Description
Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
How to fix CVE-2026-3889
To remediate CVE-2026-3889, upgrade the affected package to a fixed version below.
- Debian/thunderbird—upgrade to 1:140.9.0esr-1~deb11u1 or later
Is CVE-2026-3889 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:140.9.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |