CVE-2026-9309 — Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection
Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive UR…
Published: 2026-06-01 · CVSS: 5.4 · CVSS 3.1
Firefox for iOS Reader View did not properly escape HTML tags in JSON-LD metadata. A malicious page could inject markup that changed Reader View behavior and leaked sensitive URL parameters. These parameters could then be used to access internal pages, potentially resulting in arbitrary JavaScript execution in an internal origin. This vulnerability was fixed in Firefox for iOS 151.2.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7