What’s Vulnerable › Vulnerabilities

CVE-2026-11799: UXSS in Focus for iOS / Klar Webkit navigation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-79

Description

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

How to fix

Upgrade to a fixed version: Mozilla Focus 151.3.1; Mozilla Klar 151.3.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1975667
• https://www.mozilla.org/security/advisories/mfsa2026-55/

Get alerted when CVE-2026-11799 or the next vulnerability affects your stack