CVE-2026-9308— Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order
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 for iOS是美国Mozilla基金会的一款针对iOS设备设计的网页浏览器。 Mozilla Firefox for iOS 151.2之前版本存在安全漏洞，该漏洞源于Reader View在替换其他内部占位符之前替换了HTML模板中的页面内容，可能导致恶意页面包含占位符字符串，随后被JSON-LD数据替换，可能导致任意JavaScript执行。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox for iOS | 151.2≤ * |
unaffected |
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I. Basic Information for CVE-2026-9308
Vulnerability Information
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Vulnerability Title
Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order
Source: CVE Program / CVE List V5
Vulnerability Description
Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. 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 for iOS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox for iOS是美国Mozilla基金会的一款针对iOS设备设计的网页浏览器。 Mozilla Firefox for iOS 151.2之前版本存在安全漏洞，该漏洞源于Reader View在替换其他内部占位符之前替换了HTML模板中的页面内容，可能导致恶意页面包含占位符字符串，随后被JSON-LD数据替换，可能导致任意JavaScript执行。
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-2026-9308
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9308 (1)
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V. Comments for CVE-2026-9308
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