CVE-2026-9309— Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection
Quick assessment
Affected
Mozilla Firefox 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 Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 151.2之前版本存在安全漏洞，该漏洞源于Reader View未正确转义JSON-LD元数据中的HTML标签，可能导致恶意页面注入改变Reader View行为的标记并泄露敏感URL参数，这些参数可用于访问内部页面，可能导致在内部源中执行任意JavaScript。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox for iOS | 151.2≤ * |
unaffected |
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I. Basic Information for CVE-2026-9309
Vulnerability Information
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Vulnerability Title
Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection
Source: CVE Program / CVE List V5
Vulnerability Description
Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScript execution in an internal origin. This vulnerability was fixed in Firefox for iOS 151.2.
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 Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 151.2之前版本存在安全漏洞，该漏洞源于Reader View未正确转义JSON-LD元数据中的HTML标签，可能导致恶意页面注入改变Reader View行为的标记并泄露敏感URL参数，这些参数可用于访问内部页面，可能导致在内部源中执行任意JavaScript。
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 | Firefox for iOS | 151.2 ~ * | - |
|
II. Public POCs for CVE-2026-9309
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9309 (1)
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V. Comments for CVE-2026-9309
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