What is CVE-2022-42931?

CVE-2022-42931 is a low-severity vulnerability in Mozilla Firefox, classified under Cleartext Storage of Sensitive Information. CVSS score: 3.3/10. Published 2022-12-22.

How severe is CVE-2022-42931?

Low severity. CVSS v3 base score is 3.3 out of 10.

Vulnerability in Mozilla Firefox

CVE-2022-42931

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.

Published 2022-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)
www.mozilla.org/security/advisories/mfsa2022-44/ (Vendor Advisory)

Frequently asked questions

What is CVE-2022-42931?: CVE-2022-42931 is a low-severity vulnerability in Mozilla Firefox, classified under Cleartext Storage of Sensitive Information. CVSS score: 3.3/10. Published 2022-12-22.
How severe is CVE-2022-42931?: Low severity. CVSS v3 base score is 3.3 out of 10.