What is CVE-2018-12400?

CVE-2018-12400 is a medium-severity vulnerability in Google Android, classified under Information Disclosure. CVSS score: 5.3/10. Published 2019-02-28.

How severe is CVE-2018-12400?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Google Android

CVE-2018-12400

In private browsing mode on Firefox for Android, favicons are cached in the cache/icons folder as they are in non-private mode. This allows information leakage of sites visited during private browsing sessions. *Note: this issue only affects Firefox for Android. Desktop versions of Firefox are unaffected.*. This vulnerability affects Firefox < 63.

Vulnerability class: Information Disclosure

Published 2019-02-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Google Android
Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

bugzilla.mozilla.org/show_bug.cgi (Vendor Advisory, Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2018-26/ (Vendor Advisory)
www.securityfocus.com/bid/105721 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1041944 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-12400?: CVE-2018-12400 is a medium-severity vulnerability in Google Android, classified under Information Disclosure. CVSS score: 5.3/10. Published 2019-02-28.
How severe is CVE-2018-12400?: Medium severity. CVSS v3 base score is 5.3 out of 10.