Firefox iOS Translation Feature Allows Privileged Code Execution

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.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-103418 is a high-severity vulnerability affecting Firefox for iOS where unsanitized HTML language attributes are directly interpolated into translation JavaScript code. This flaw allows attackers to inject malicious markup that executes with privileged access in Firefox's content world, effectively bypassing the page's Content Security Policy protections. Users of Firefox for iOS below version 157.1 are at risk when visiting attacker-controlled or compromised websites that exploit this injection vector. The vulnerability is particularly dangerous because it operates at the browser engine level, granting attackers capabilities they shouldn't normally have access to.

Casky's 323 mapped skills detect the attack patterns underlying this CVE by correlating MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance - Search Open Websites/Domains) with CWE-79 (Cross-Site Scripting) exploitation chains. Security practitioners using Casky would identify suspicious signals including: abnormal JavaScript injection attempts targeting language configuration parameters, privilege escalation indicators where page-level scripts gain browser-level capabilities, and CSP bypass attempts that correlate with translation feature abuse. Claude's extended reasoning capabilities analyze how attackers probe for language attribute manipulation before injection, then correlate these reconnaissance patterns with payload delivery mechanisms—enabling practitioners to detect both the initial reconnaissance phase and the exploitation phase across their security infrastructure.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-103418.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-103418

Casky has 323 skills that investigate the attack patterns behind CVE-2026-103418. Run one and get CVSS-scored findings in 3 minutes.

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