CVE-2015-5961: Mozilla Firefox OS

Low severity, CVSS 3.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The COPPA error page in the Accounts setup dialog in Mozilla Firefox OS before 2.2 embeds content from an external web server URL into the System process, which allows man-in-the-middle attackers to bypass intended access restrictions by spoofing that server.

Affected products

• Mozilla Firefox OS: up to and including 2.1.0

Published 2015-08-08. Last modified 2026-06-17.