High severity · published Jun 9, 2026
CVE-2026-11799
UXSS in Focus for iOS / Klar Webkit navigation
7.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Focus · Mozilla
before 151.3.1 · source: NVD
KL
Klar · Mozilla
before 151.3.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11799
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11799
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1975667
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-55/
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