CVE-2026-9308 PUBLISHED

Arbitrary JavaScript execution in Reader View due to wrong HTML replacement order

Assigner: mozilla
Reserved: 22.05.2026 Published: 01.06.2026 Updated: 01.06.2026

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was fixed in Firefox for iOS 151.2.

Product Status

Vendor Mozilla
Product Firefox for iOS
Versions
  • unaffected from 151.2 to * (incl.)

Credits

  • Muneaki Nishimura

References