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CVE-2026-103418

High

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.

SeverityHigh
CVSS8.8
Exploit probability—
ProductFirefox for iOS
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update
  • Mozilla Firefox for iOS157.1 or later

Affected products

ProductAffected versionsFixed in
Mozilla Firefox for iOSNo range specified157.1

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