---
id: CVE-2026-103418
title: >-
  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…
summary: >-
  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…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T13:17:13.507'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103418'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2062109'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-105/'
    label: security@mozilla.org
tags:
  - nvd
ingestedAt: '2026-10-13T08:19:03.891Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.