What is CVE-2022-31746?

CVE-2022-31746 is a medium-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 6.5/10. Published 2022-12-22.

How severe is CVE-2022-31746?

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

Information disclosure in Mozilla Firefox

CVE-2022-31746

Internal URLs are protected by a secret UUID key, which could have been leaked to web page through the Referrer header. This vulnerability affects Firefox for iOS < 102.

Vulnerability class: Information Disclosure

Published 2022-12-22 · last modified 2026-08-19.

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:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.6th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Mozilla Firefox
Mozilla Firefox For iOS — versions unspecified
Mozilla Firefox Mobile

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.mozilla.org/security/advisories/mfsa2022-27/ (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)

Frequently asked questions

What is CVE-2022-31746?: CVE-2022-31746 is a medium-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 6.5/10. Published 2022-12-22.
How severe is CVE-2022-31746?: Medium severity. CVSS v3 base score is 6.5 out of 10.