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Fencer Vulns
medium 6.1

CVE-2022-29912 json

Requests initiated through reader mode did not properly omit cookies with a SameSite attribute.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-34222

cvss
6.1
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

Requests initiated through reader mode did not properly omit cookies with a SameSite attribute. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Patch / fix

  • Mozilla Thunderbird 91.9
  • Mozilla Firefox ESR 91.9
  • Mozilla Firefox 100
  • firefox-esr Debian 14, Debian 13, Debian 12 91.9.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.9.0-1

debian advisories DEBIAN-CVE-2022-29912

  • firefox Ubuntu 18.04 LTS 100.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 100.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:91.9.1+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.9.1+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.9.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-29912

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 91.9.0-3.el9_0
  • thunderbird RHEL 7 91.9.0-3.el7_9
  • thunderbird RHEL 8 91.9.0-3.el8_5
  • firefox RHEL 7 91.9.0-1.el7_9
  • firefox RHEL 8 91.9.0-1.el8_5
  • firefox RHEL 9 91.9.0-1.el9_0
  • thunderbird RHEL 8.4 EUS 91.9.0-3.el8_4
  • thunderbird RHEL 8.2 EUS 91.9.0-3.el8_2

red hat advisories RHSA-2022:4589RHSA-2022:1726RHSA-2022:1725RHSA-2022:1724RHSA-2022:1727RHSA-2022:1730

  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 91.9.0-112.108.4
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 91.9.0-150200.152.37.3
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91.9.0-150000.150.38.3
  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 91.9.0-150200.8.68.2
  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 91.9.0-150200.152.33.1

suse advisories SUSE-SU-2022:1757-1SUSE-SU-2022:1748-1SUSE-SU-2022:1731-1SUSE-SU-2022:1719-1SUSE-RU-2022:1579-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 100.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.9.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12044-1openSUSE-SU-2024:12045-1

  • thunderbird AlmaLinux 8 91.9.0-3.el8_5.alma
  • firefox AlmaLinux 8 91.9.0-1.el8_5.alma

almalinux advisories ALSA-2022:1730ALSA-2022:1705

  • thunderbird Rocky Linux 8 91.9.0-3.el8_5
  • firefox Rocky Linux 8 91.9.0-1.el8_5

rocky linux advisories RLSA-2022:1730RLSA-2022:1705

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 100.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 100.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 91.9.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.9.0-r0

alpine advisories ALPINE-CVE-2022-29912

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 100.0-1
  • thunderbird Arch Linux 91.9-1

arch linux advisories AVG-2709AVG-2710

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-2022-29912 updated cvss 6.1

Mozilla: Reader mode bypassed SameSite cookies

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.9.0-1.el8_5, thunderbird 91.9.0-3.el8_5
    fixed: vendor fix RHSA-2022:1705
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 91.9.0-1.el9_0, thunderbird 91.9.0-3.el9_0
    fixed: vendor fix RHSA-2022:4590
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.9.0-1.el8_1, thunderbird 91.9.0-3.el8_1
    fixed: vendor fix RHSA-2022:1701
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.9.0-1.el8_2, thunderbird 91.9.0-3.el8_2
    fixed: vendor fix RHSA-2022:1704
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.9.0-1.el8_4, thunderbird 91.9.0-3.el8_4
    fixed: vendor fix RHSA-2022:1702
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.9.0-1.el7_9, thunderbird 91.9.0-3.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.9.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.9.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.9.0-1.el7_9, thunderbird 91.9.0-3.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.9.0-1.el7_9, thunderbird 91.9.0-3.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.9.0-1.el7_9
    fixed: vendor fix RHSA-2022:1703

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
18 mo ago

Exploit prediction

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

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1692655 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 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 Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

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.