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CVE-2026-103418— Universal XSS via the HTML language attribute in Translation Services

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.

Firefox for iOS 直接将页面的 HTML 语言属性插入到翻译 JavaScript 中，使得攻击者控制的标记能够在 Firefox 的特权内容世界中执行代码，并绕过页面的内容安全策略（CSP）。该漏洞已在 Firefox for iOS 157.1 版本中修复。

AI Predicted 9.6 Difficulty: Easy EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mozilla Firefox for iOS 157.1≤ * unaffected
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I. Basic Information for CVE-2026-103418

Vulnerability Information
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Vulnerability Title
Universal XSS via the HTML language attribute in Translation Services
Source: CVE Program / CVE List V5
Vulnerability Description
Firefox for iOS directly interpolated the page’s HTML language attribute into translation JavaScript, allowing attacker-controlled markup to execute code in Firefox’s privileged content world and bypass the page’s Content Security Policy. This vulnerability was fixed in Firefox for iOS 157.1.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox for iOS 157.1 ~ * -

II. Public POCs for CVE-2026-103418

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103418

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Other References for CVE-2026-103418 (1)

Same Patch Batch · Mozilla · 2026-10-13 · 83 CVEs total

CVE-2026-109736 Frame poisoning in the Layout component
CVE-2026-109749 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-109733 JIT miscompilation in the JavaScript Engine: JIT component
CVE-2026-109706 Use-after-free in the Storage: IndexedDB component
CVE-2026-109715 Incorrect boundary conditions in the JavaScript Engine component
CVE-2026-109730 Integer overflow in the Graphics component
CVE-2026-109714 Incorrect boundary conditions in the Layout component
CVE-2026-109707 Sandbox escape due to use-after-free in the Networking component
CVE-2026-109720 JIT miscompilation in the JavaScript: WebAssembly component
CVE-2026-109760 Mitigation bypass in the Networking: HTTP component
CVE-2026-109731 Incorrect boundary conditions in the Graphics: Canvas2D component
CVE-2026-109726 Use-after-free in the SVG component
CVE-2026-109748 Use-after-free in the JavaScript: WebAssembly component
CVE-2026-109705 Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free
CVE-2026-109763 Mitigation bypass in the File Handling component
CVE-2026-109767 Information disclosure in the Networking component
CVE-2026-109751 Information disclosure in the Networking component
CVE-2026-109743 Privilege escalation in the Panning and Zooming component
CVE-2026-109732 Use-after-free in the DOM: Streams component
CVE-2026-109713 Use-after-free in the Crash Reporting component

Showing top 20 of 83 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox for iOS
Same vendor: Mozilla

V. Comments for CVE-2026-103418

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