CVE-2026-8955

EUVD-2026-30905
Privilege escalation in the DOM: Workers 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: 30%
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=2031064
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/