CVE-2026-103418

UNKNOWN 0.0

Universal XSS via the HTML language attribute in Translation Services

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox for ios
Ecosystems	Browser JavaScript
Industries	Technology
Published	Oct 13, 2026

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Affected Versions

Mozilla / Firefox for iOS

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2062109 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-105/

Credits

Muneaki Nishimura