CVE-2026-8970

EUVD-2026-30920
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 22%
Affected Products (NVD)
VendorProductVersion
mozillafirefox_esr
𝑥
< 140.11.0
mozillafirefox
𝑥
< 151.0.0
mozillathunderbird_esr
𝑥
< 140.11
mozillathunderbird
𝑥
< 151.0.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
152.0.4-1
fixed
firefox-esr
bookworm
vulnerable
bookworm (security)
140.12.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
140.12.0esr-1~deb11u1
fixed
forky
140.12.0esr-1
fixed
sid
140.12.0esr-1
fixed
trixie
vulnerable
trixie (security)
140.12.0esr-1~deb13u1
fixed
thunderbird
bookworm
vulnerable
bookworm (security)
1:140.12.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
1:140.12.0esr-1~deb11u1
fixed
forky
1:140.12.0esr-1
fixed
sid
1:140.12.0esr-1
fixed
trixie
vulnerable
trixie (security)
1:140.12.0esr-1~deb13u1
fixed
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
MozillaFirefox
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-devel
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-translations-common
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-translations-other
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaThunderbird
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
firefox
RHEL 9
0:140.11.0-1.el9_8
fixed
firefox-x11
RHEL 9
0:140.11.0-1.el9_8
fixed
thunderbird
RHEL 9
0:140.11.0-1.el9_8
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
firefox
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
thunderbird
Amazon Linux 2
0:140.11.1-1.amzn2.0.2
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2032174
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-48/
https://www.mozilla.org/security/advisories/mfsa2026-50/
https://www.mozilla.org/security/advisories/mfsa2026-51/