high 8.8

CVE-2025-14323 json

Privilege escalation in the DOM: Notifications component

published 2025-12-09 11 mo ago modified 2026-10-07 32 d ago also EUVD-2025-202163

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits: 0; none known

Privilege escalation in the DOM: Notifications component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Patch / fix

fixed in 4 distros 7

mozilla firefox 115.31, 140.6, 146
mozilla firefox_esr 115.31, 140.6, 146
mozilla thunderbird 140.6, 146
mozilla thunderbird_esr 140.6, 146

debian ubuntu red hat suse opensuse almalinux rocky linux

firefox-esr Debian 12 140.6.0esr-1~deb12u1
firefox-esr Debian 13 140.6.0esr-1~deb13u1
firefox-esr Debian 14 140.6.0esr-1
thunderbird Debian 12 1:140.6.0esr-1~deb12u1
thunderbird Debian 13 1:140.6.0esr-1~deb13u1
thunderbird Debian 14 1:140.6.0esr-1

debian advisories DEBIAN-CVE-2025-14323

thunderbird Ubuntu 22.04 LTS 1:140.7.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2025-14323

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

thunderbird RHEL 8 140.6.0-1.el8_10
thunderbird RHEL 10.1 140.6.0-1.el10_1
thunderbird RHEL 9 140.6.0-1.el9_7
firefox RHEL 8 140.6.0-1.el8_10
firefox RHEL 9 140.6.0-1.el9_7
firefox-x11 RHEL 9 140.6.0-1.el9_7
firefox RHEL 10.1 140.6.0-1.el10_1
firefox enterprise linux eus 10.0 140.6.0-1.el10_0

red hat advisories RHSA-2026:0127 RHSA-2026:0124 RHSA-2026:0026 RHSA-2026:0025 RHSA-2026:0024 RHSA-2026:0022

MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 140.6.0-160000.1.1
MozillaFirefox SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +12 more 140.6.0-150200.152.213.1
MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Workstation Extension 15 SP6, SLE Module for Package Hub 15 SP7 +2 more 140.6.0-150200.8.248.1
MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 140.6.0-112.292.1

suse advisories SUSE-SU-2026:20031-1 SUSE-SU-2025:4424-1 SUSE-SU-2025:4397-1 SUSE-SU-2025:4396-1

MozillaThunderbird openSUSE Leap 16.0 140.6.0-bp160.1.1
MozillaFirefox openSUSE Leap 16.0 140.6.0-160000.1.1
MozillaFirefox openSUSE Tumbleweed 146.0-1.1
MozillaThunderbird openSUSE Tumbleweed 140.6.0-1.1
firefox-esr openSUSE Tumbleweed 140.6.0-1.1

opensuse advisories openSUSE-SU-2026:20046-1 openSUSE-SU-2026:20014-1 openSUSE-SU-2025:15813-1 openSUSE-SU-2025:15814-1 openSUSE-SU-2025:15809-1

thunderbird AlmaLinux 10 140.6.0-1.el10_1.alma.1
thunderbird AlmaLinux 8 140.6.0-1.el8_10.alma.1
thunderbird AlmaLinux 9 140.6.0-1.el9_7.alma.1
firefox AlmaLinux 8 140.6.0-1.el8_10.alma.1
firefox AlmaLinux 9 140.6.0-1.el9_7.alma.1
firefox-x11 AlmaLinux 9 140.6.0-1.el9_7.alma.1
firefox AlmaLinux 10 140.6.0-1.el10_1

almalinux advisories ALSA-2026:0025 ALSA-2026:0026 ALSA-2025:23856 ALSA-2025:23128 ALSA-2025:23034 ALSA-2025:23035

thunderbird Rocky Linux 10 140.6.0-1.el10_1
thunderbird Rocky Linux 8 140.6.0-1.el8_10
thunderbird Rocky Linux 9 140.6.0-1.el9_7
firefox Rocky Linux 8 140.6.0-1.el8_10
firefox Rocky Linux 10 140.6.0-1.el10_1
firefox Rocky Linux 9 140.6.0-1.el9_7

rocky linux advisories RLSA-2026:0025 RLSA-2026:0026 RLSA-2025:23856 RLSA-2025:23128 RLSA-2025:23035 RLSA-2025:23034

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-14323 updated 2026-11-04 cvss 7.5

firefox: thunderbird: Privilege escalation in the DOM: Notifications component

Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux 10 firefox-flatpak, thunderbird-flatpak
affected: workaround, no fix available
Red Hat Enterprise Linux AppStream (v. 8) firefox 140.6.0-1.el8_10, thunderbird 140.6.0-1.el8_10
fixed: vendor fix RHSA-2025:23128
Red Hat Enterprise Linux AppStream (v. 9) firefox 140.6.0-1.el9_7, firefox-x11 140.6.0-1.el9_7, thunderbird 140.6.0-1.el9_7
fixed: vendor fix RHSA-2025:23034
Red Hat Enterprise Linux AppStream (v. 10) firefox 140.6.0-1.el10_1, thunderbird 140.6.0-1.el10_1
fixed: vendor fix RHSA-2025:23035
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 140.6.0-1.el8_2, thunderbird 140.6.0-1.el8_2
fixed: vendor fix RHSA-2026:0005
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.6.0-2.el8_4, thunderbird 140.6.0-1.el8_4
fixed: vendor fix RHSA-2026:0006
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.6.0-2.el8_6, thunderbird 140.6.0-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 140.6.0-2.el8_6, thunderbird 140.6.0-1.el8_6
fixed: vendor fix RHSA-2026:0014

show 10 more

Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.6.0-2.el8_8, thunderbird 140.6.0-1.el8_8
fixed: vendor fix RHSA-2026:0015
Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 140.6.0-1.el9_0, thunderbird 140.6.0-1.el9_0
fixed: vendor fix RHSA-2026:0018
Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.6.0-1.el9_2, firefox-x11 140.6.0-1.el9_2, thunderbird 140.6.0-1.el9_2
fixed: vendor fix RHSA-2026:0017
Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.6.0-1.el10_0, thunderbird 140.6.0-1.el10_0
fixed: vendor fix RHSA-2026:0127
Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox 140.6.0-1.el9_4, firefox-x11 140.6.0-1.el9_4, thunderbird 140.6.0-1.el9_4
fixed: vendor fix RHSA-2026:0016
Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.6.0-2.el9_6, firefox-x11 140.6.0-2.el9_6, thunderbird 140.6.0-1.el9_6
fixed: vendor fix RHSA-2026:0013
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.6.0-2.el8_4, thunderbird 140.6.0-1.el8_4
fixed: vendor fix RHSA-2026:0006
Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 140.6.0-2.el8_6, thunderbird 140.6.0-1.el8_6
fixed: vendor fix RHSA-2026:0014
Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.6.0-2.el8_8, thunderbird 140.6.0-1.el8_8
fixed: vendor fix RHSA-2026:0015
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.6.0-1.el7_9
fixed: vendor fix RHSA-2026:0007

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 10 mo ago (2025-12-10)

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Mozilla Firefox
Mozilla Thunderbird

References

mozilla.org /security/advisories/mfsa2025-92/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-93/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-94/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-95/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-96/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1996555
issue-tracking, permissions-required

Sources

CVE List CVE-2025-14323
NVD CVE-2025-14323

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary