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

Quick assessment

Affected
Mozilla Focus for iOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Focus for iOS和Mozilla Klar for iOS都是美国Mozilla基金会的一款注重隐私保护的移动网页浏览器。 Mozilla Focus for iOS 151.3.1之前版本和Mozilla Klar for iOS 151.3.1之前版本存在安全漏洞，该漏洞源于WebKit导航中的通用跨站脚本问题。

AI Predicted 8.6 Difficulty: Easy EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Focus for iOS 151.3.1≤ * unaffected
Mozilla Klar for iOS 151.3.1≤ * unaffected
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I. Basic Information for CVE-2026-11799

Vulnerability Information
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Vulnerability Title
UXSS in Focus for iOS / Klar Webkit navigation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Focus for iOS和Mozilla Klar for iOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Focus for iOS和Mozilla Klar for iOS都是美国Mozilla基金会的一款注重隐私保护的移动网页浏览器。 Mozilla Focus for iOS 151.3.1之前版本和Mozilla Klar for iOS 151.3.1之前版本存在安全漏洞，该漏洞源于WebKit导航中的通用跨站脚本问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Focus for iOS 151.3.1 ~ * -
Mozilla Klar for iOS 151.3.1 ~ * -

II. Public POCs for CVE-2026-11799

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-11799

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Vendor Advisories for CVE-2026-11799 (1)

IV. Related Vulnerabilities

Same product: Focus for iOS
Same vendor: Mozilla

V. Comments for CVE-2026-11799

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