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Fencer Vulns
high 7.5

CVE-2023-4583 json

Browsing Context potentially not cleared when closing Private Window

published 2023-09-11 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54437

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Patch / fix

  • Mozilla Firefox 117
  • Mozilla Firefox ESR 115.2
  • Mozilla Thunderbird 115.2
  • firefox-esr Debian 14, Debian 13 115.2.0esr-1
  • thunderbird Debian 14, Debian 13 1:115.2.0-1

debian advisories DEBIAN-CVE-2023-4583

  • firefox Ubuntu 20.04 LTS 117.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 20.04 LTS 1:115.3.1+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:115.3.1+build1-0ubuntu0.22.04.2

ubuntu advisories UBUNTU-CVE-2023-4583

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 9 102.15.0-1.el9_2
  • firefox RHEL 7 102.15.0-1.el7_9
  • thunderbird RHEL 7 102.15.0-1.el7_9
  • firefox RHEL 8 102.15.0-1.el8_8
  • thunderbird RHEL 8 102.15.0-1.el8_8
  • firefox RHEL 9 102.15.0-1.el9_2
  • firefox-x11 RHEL 9 102.15.0-1.el9_2
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 102.15.0-1.el8_2

red hat advisories RHSA-2023:4955RHSA-2023:4946RHSA-2023:4947RHSA-2023:4948RHSA-2023:5019RHSA-2023:4945

  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +3 more 115.2.2-150200.8.130.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.2.0-112.176.1
  • MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +10 more 115.2.0-150200.152.102.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.2.0-150000.150.100.1

suse advisories SUSE-SU-2023:3664-1SUSE-SU-2023:3562-1SUSE-SU-2023:3559-1SUSE-SU-2023:3519-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 117.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 115.2.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:13176-1openSUSE-SU-2024:13202-1

  • firefox AlmaLinux 8 102.15.0-1.el8_8.alma
  • thunderbird AlmaLinux 8 102.15.0-1.el8_8.alma
  • thunderbird AlmaLinux 9 102.15.0-1.el9_2.alma
  • firefox AlmaLinux 9 102.15.0-1.el9_2.alma
  • firefox-x11 AlmaLinux 9 102.15.0-1.el9_2.alma

almalinux advisories ALSA-2023:4952ALSA-2023:4954ALSA-2023:4955ALSA-2023:4958

  • firefox Rocky Linux 8 102.15.0-1.el8_8
  • thunderbird Rocky Linux 8 102.15.0-1.el8_8

rocky linux advisories RLSA-2023:4952RLSA-2023:4954

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.2.0-r0

alpine advisories ALPINE-CVE-2023-4583

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2023-4583 updated cvss 7.5

Mozilla: Browsing Context potentially not cleared when closing Private Window

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 102.15.0-1.el8_8, thunderbird 102.15.0-1.el8_8
    fixed: vendor fix RHSA-2023:4952
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 102.15.0-1.el9_2, firefox-x11 102.15.0-1.el9_2, thunderbird 102.15.0-1.el9_2
    fixed: vendor fix RHSA-2023:4958
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 102.15.0-1.el8_2, thunderbird 102.15.0-1.el8_2
    fixed: vendor fix RHSA-2023:4951
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 102.15.0-1.el8_4, thunderbird 102.15.0-1.el8_4
    fixed: vendor fix RHSA-2023:4957
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 102.15.0-1.el8_1, thunderbird 102.15.0-1.el8_1
    fixed: vendor fix RHSA-2023:4949
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 102.15.0-1.el8_2, thunderbird 102.15.0-1.el8_2
    fixed: vendor fix RHSA-2023:4951
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 102.15.0-1.el8_4, thunderbird 102.15.0-1.el8_4
    fixed: vendor fix RHSA-2023:4957
show 5 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 102.15.0-1.el8_6
    fixed: vendor fix RHSA-2023:4959
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 102.15.0-1.el9_0, thunderbird 102.15.0-1.el9_0
    fixed: vendor fix RHSA-2023:4950
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 102.15.0-1.el8_2, thunderbird 102.15.0-1.el8_2
    fixed: vendor fix RHSA-2023:4951
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 102.15.0-1.el8_4, thunderbird 102.15.0-1.el8_4
    fixed: vendor fix RHSA-2023:4957
  • Red Hat Enterprise Linux Client (v. 7) firefox 102.15.0-1.el7_9, thunderbird 102.15.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 102.15.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 102.15.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 102.15.0-1.el7_9, thunderbird 102.15.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 102.15.0-1.el7_9, thunderbird 102.15.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 102.15.0-1.el7_9
    fixed: vendor fix RHSA-2023:5019

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
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.69% 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
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

References

Sources

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.