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Fencer Vulns
low 3.3

CVE-2022-42931 json

Logins saved by Firefox should be managed by the Password Manager component which uses encryption to save files on-disk.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-45987

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

Logins saved by Firefox should be managed by the Password Manager component which uses encryption to save files on-disk. Instead, the username (not password) was saved by the Form Manager to an unencrypted file on disk. This vulnerability affects Firefox < 106.

Patch / fix

  • Mozilla Firefox 106
  • firefox Ubuntu 18.04 LTS 106.0.2+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 106.0.2+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:102.4.2+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.4.2+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.4.2+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-42931

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-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 106.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12429-1

CISA SSVC

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

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1780571 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-312 Cleartext Storage of Sensitive Information

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.