CVE-2026-100823: Mozilla Firefox Mobile

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Spoofing issue in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 157.

Affected products

• Mozilla Firefox Mobile: before 157.0 (fixed in 157.0)

Published 2026-09-29. Last modified 2026-10-05.