CVE-2026-84127: Mozilla Firefox Mobile

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Information disclosure in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 155.

Affected products

• Mozilla Firefox Mobile: before 155.0 (fixed in 155.0)

Published 2026-09-01. Last modified 2026-09-03.