CVE-2018-12400: Mozilla Firefox

Medium severity, CVSS 5.3. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• Mozilla Firefox: before 63.0 (fixed in 63.0)

Published 2019-02-28. Last modified 2026-06-17.