CVE-2026-103418: Vulnerability in Mozilla Firefox for iOS
Description
A vulnerability in Firefox for iOS allowed attacker-controlled HTML language attributes to execute code in privileged content, bypassing Content Security Policy. This issue was fixed in version 157.1.
Affected software
Mozilla
Firefox for iOS
pkg:github/mozilla/firefox-iosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103418 is a security vulnerability in Mozilla Firefox for iOS where the browser directly interpolated the page's HTML language attribute into translation JavaScript. This flaw enabled attacker-controlled markup to execute code within Firefox's privileged content world, effectively bypassing the page's Content Security Policy. The vulnerability was addressed and fixed in Firefox for iOS version 157.1.
Potential Impact
An attacker could exploit this vulnerability to execute arbitrary code in Firefox's privileged content context, bypassing Content Security Policy protections. This could lead to unauthorized actions within the browser environment on iOS devices running affected versions of Firefox.
Mitigation Recommendations
Users should update Firefox for iOS to version 157.1 or later, where this vulnerability has been fixed. No additional mitigation steps are required once the update is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-30T14:48:16.869Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-105/","vendor":"Mozilla"}]
Threat ID: 6acde2692cdf04f6563ccc12
Added to database: 10/13/2026, 07:48:57 UTC
Last enriched: 10/13/2026, 08:03:24 UTC
Last updated: 10/13/2026, 08:08:21 UTC
Views: 6
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