What is CVE-2022-28283?

CVE-2022-28283 is a medium-severity vulnerability in Mozilla Firefox, classified under Files or Directories Accessible to External Parties. CVSS score: 6.5/10. Published 2022-12-22.

How severe is CVE-2022-28283?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Mozilla Firefox

CVE-2022-28283

The sourceMapURL feature in devtools was missing security checks that would have allowed a webpage to attempt to include local files or other files that should have been inaccessible. This vulnerability affects Firefox < 99.

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

www.mozilla.org/security/advisories/mfsa2022-13/ (Exploit, Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2022-28283?: CVE-2022-28283 is a medium-severity vulnerability in Mozilla Firefox, classified under Files or Directories Accessible to External Parties. CVSS score: 6.5/10. Published 2022-12-22.
How severe is CVE-2022-28283?: Medium severity. CVSS v3 base score is 6.5 out of 10.