CVE-2026-3889

EUVD-2026-15019
Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
UI
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 10.65%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
mozillathunderbird
𝑥
< 149.0
CNA
mozillathunderbird_esr
𝑥
< 140.9.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
thunderbird
bookworm
1:140.12.0esr-1~deb12u1
fixed
bookworm (security)
1:153.6.0esr-1~deb12u1
fixed
forky
1:153.5.0esr-1
fixed
sid
1:153.6.0esr-1
fixed
trixie
1:140.12.0esr-1~deb13u1
fixed
trixie (security)
1:153.6.0esr-1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
stonking
not-affected
thunderbird
jammy
needed
noble
not-affected
questing
not-affected
resolute
not-affected
stonking
not-affected
mozjs38
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
stonking
dne
mozjs52
bionic
ignored
focal
ignored
jammy
dne
noble
dne
questing
dne
resolute
dne
stonking
dne
mozjs68
focal
ignored
jammy
dne
noble
dne
questing
dne
resolute
dne
stonking
dne
mozjs78
jammy
ignored
noble
dne
questing
dne
resolute
dne
stonking
dne
mozjs91
jammy
ignored
noble
dne
questing
dne
resolute
dne
stonking
dne
mozjs102
jammy
ignored
noble
ignored
questing
dne
resolute
dne
stonking
dne
mozjs115
jammy
dne
noble
ignored
questing
dne
resolute
dne
stonking
dne
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
MozillaThunderbird
suse enterprise desktop 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise sap 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise server 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise workstation 15 SP7
140.9.0-150200.8.263.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise sap 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise server 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise workstation 15 SP7
140.9.0-150200.8.263.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise sap 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise server 15 SP7
140.9.0-150200.8.263.1
fixed
suse enterprise workstation 15 SP7
140.9.0-150200.8.263.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
thunderbird
RHEL 9
0:140.9.0-1.el9_7
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
thunderbird
Amazon Linux 2
0:140.9.0-1.amzn2.0.2
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2020723
https://www.mozilla.org/security/advisories/mfsa2026-23/
https://www.mozilla.org/security/advisories/mfsa2026-24/