CVE-2023-6867: The timing of a button click causing a popup to disappear was approximately the same length as the anti-clickjacking delay on permission pr…

Patch / fix

fixed in 2 distros 8

Mozilla Firefox ESR 115.6
Mozilla Firefox 121

debian ubuntu red hat suse opensuse almalinux rocky linux alpine

firefox-esr Debian 12 115.6.0esr-1~deb12u1
firefox-esr Debian 14, Debian 13 115.6.0esr-1

debian advisories DEBIAN-CVE-2023-6867

firefox Ubuntu 20.04 LTS 121.0+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2023-6867

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

firefox RHEL 7 115.6.0-1.el7_9
firefox RHEL 9 115.6.0-1.el9_3
firefox-x11 RHEL 9 115.6.0-1.el9_3
firefox RHEL 8 115.6.0-1.el8_9
firefox RHEL 9.0 EUS 115.6.0-1.el9_0
firefox RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 115.6.0-1.el8_2
firefox RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 115.6.0-1.el8_4
firefox RHEL 8.6 EUS 115.6.0-1.el8_6

red hat advisories RHSA-2024:0022 RHSA-2024:0023 RHSA-2024:0021 RHSA-2024:0024 RHSA-2024:0019 RHSA-2024:0026

MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +14 more 115.6.0-150200.152.120.1
MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.6.0-112.194.1
MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.6.0-150000.150.119.1

suse advisories SUSE-SU-2023:4929-1 SUSE-SU-2023:4928-1 SUSE-SU-2023:4912-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 121.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:13531-1

firefox AlmaLinux 8 115.6.0-1.el8_9.alma
firefox AlmaLinux 9 115.6.0-1.el9_3.alma
firefox-x11 AlmaLinux 9 115.6.0-1.el9_3.alma

almalinux advisories ALSA-2024:0012 ALSA-2024:0025

firefox Rocky Linux 8 115.6.0-1.el8_9

rocky linux advisories RLSA-2024:0012

firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.6.0-r0

alpine advisories ALPINE-CVE-2023-6867

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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-2023-6867 updated 2026-11-05 cvss 6.1

Mozilla: Clickjacking permission prompts using the popup transition

Red Hat Enterprise Linux 6 firefox
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) firefox 115.6.0-1.el8_9
fixed: vendor fix RHSA-2024:0012
Red Hat Enterprise Linux AppStream (v. 9) firefox 115.6.0-1.el9_3, firefox-x11 115.6.0-1.el9_3
fixed: vendor fix RHSA-2024:0025
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.6.0-1.el8_2
fixed: vendor fix RHSA-2024:0023
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.6.0-1.el8_4
fixed: vendor fix RHSA-2024:0021
Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 115.6.0-1.el8_2
fixed: vendor fix RHSA-2024:0023
Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.6.0-1.el8_4
fixed: vendor fix RHSA-2024:0021
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 115.6.0-1.el8_6
fixed: vendor fix RHSA-2024:0024

show 7 more

Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 115.6.0-1.el8_8
fixed: vendor fix RHSA-2024:0011
Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.6.0-1.el9_0
fixed: vendor fix RHSA-2024:0022
Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 115.6.0-1.el9_2, firefox-x11 115.6.0-1.el9_2
fixed: vendor fix RHSA-2024:0019
Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 115.6.0-1.el8_2
fixed: vendor fix RHSA-2024:0023
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.6.0-1.el8_4
fixed: vendor fix RHSA-2024:0021
Red Hat Enterprise Linux Client (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.6.0-1.el7_9
fixed: vendor fix RHSA-2024:0026
Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird Red Hat Enterprise Linux 8 thunderbird Red Hat Enterprise Linux 9 thunderbird
not affected: vulnerable code not present

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: partial
Assessed: 2 y ago (2024-08-27)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Mozilla Firefox ESR
Mozilla Firefox

Classification

Weakness

CWE-1021 Improper Restriction of Rendered UI Layers or Frames

References

mozilla.org /security/advisories/mfsa2023-54/
vendor-advisory
mozilla.org /security/advisories/mfsa2023-56/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1863863
issue-tracking, permissions-required
debian.org /security/2023/dsa-5581
third-party-advisory
lists.debian.org /debian-lts-announce/2023/12/msg00020.html
mailing-list, third-party-advisory
security.gentoo.org /glsa/202401-10
third-party-advisory

Sources

CVE List CVE-2023-6867
NVD CVE-2023-6867

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.

Summary