CVE-2021-29993: Mozilla Firefox Mobile

High severity, CVSS 8.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Firefox for Android allowed navigations through the `intent://` protocol, which could be used to cause crashes and UI spoofs. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92.

Affected products

• Mozilla Firefox Mobile: before 92.0 (fixed in 92.0)

Published 2021-11-03. Last modified 2026-08-19.