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Fencer Vulns
medium 6.5

CVE-2022-31738 json

When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user…

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-53136

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Patch / fix

  • Mozilla Thunderbird 91.10
  • Mozilla Firefox 101
  • Mozilla Firefox ESR 91.10
  • firefox-esr Debian 14, Debian 13, Debian 12 91.10.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.10.0-1

debian advisories DEBIAN-CVE-2022-31738

  • firefox Ubuntu 18.04 LTS 101.0.1+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 101.0.1+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:91.11.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.11.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.11.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-31738

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 91.10.0-1.el8_6
  • thunderbird RHEL 9 91.10.0-1.el9_0
  • firefox RHEL 7 91.10.0-1.el7_9
  • thunderbird RHEL 7 91.10.0-1.el7_9
  • firefox RHEL 8 91.10.0-1.el8_6
  • firefox RHEL 9 91.10.0-1.el9_0
  • thunderbird RHEL 8.2 EUS 91.10.0-1.el8_2
  • thunderbird RHEL 8.1 E4S 91.10.0-1.el8_1

red hat advisories RHSA-2022:4890RHSA-2022:4888RHSA-2022:4887RHSA-2022:4889RHSA-2022:4871RHSA-2022:4892

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 91.10.0-150200.8.73.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91.10.0-150000.150.44.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 91.10.0-112.114.1
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 91.10.0-150200.152.43.1

suse advisories SUSE-SU-2022:2062-1SUSE-SU-2022:1927-1SUSE-SU-2022:1921-1SUSE-SU-2022:1920-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.10.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 101.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12117-1openSUSE-SU-2024:12121-1

  • thunderbird Rocky Linux 8 91.10.0-1.el8_6
  • firefox Rocky Linux 8 91.10.0-1.el8_6

rocky linux advisories RLSA-2022:4887RLSA-2022:4872

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 101.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 101.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 91.10.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.10.0-r0

alpine advisories ALPINE-CVE-2022-31738

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

  • firefox Arch Linux 101.0-1
  • thunderbird Arch Linux 91.10-1

arch linux advisories AVG-2760AVG-2761

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-2022-31738 updated cvss 7.5

Mozilla: Browser window spoof using fullscreen mode

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.10.0-1.el8_6, thunderbird 91.10.0-1.el8_6
    fixed: vendor fix RHSA-2022:4872
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 91.10.0-1.el9_0, thunderbird 91.10.0-1.el9_0
    fixed: vendor fix RHSA-2022:4873
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.10.0-1.el8_1, thunderbird 91.10.0-1.el8_1
    fixed: vendor fix RHSA-2022:4871
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.10.0-1.el8_2, thunderbird 91.10.0-1.el8_2
    fixed: vendor fix RHSA-2022:4876
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.10.0-1.el8_4, thunderbird 91.10.0-1.el8_4
    fixed: vendor fix RHSA-2022:4875
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.10.0-1.el7_9, thunderbird 91.10.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.10.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.10.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.10.0-1.el7_9, thunderbird 91.10.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.10.0-1.el7_9, thunderbird 91.10.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.10.0-1.el7_9
    fixed: vendor fix RHSA-2022:4870

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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1756388 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox
  • Mozilla Firefox ESR

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

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.