CVE-2026-11799: Mozilla Focus

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

UXSS in Focus for iOS / Klar Webkit navigation. This vulnerability was fixed in Focus for iOS 151.3.1 and Klar for iOS 151.3.1.

Affected products

• Mozilla Focus: before 151.3.1 (fixed in 151.3.1)
• Mozilla Klar: before 151.3.1 (fixed in 151.3.1)

Published 2026-06-09. Last modified 2026-07-23.