CVE-2026-9309: 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…

PriorityP427medium5.4CVSS 3.1

AVNACLPRNUIRSUCLILAN

EPSS

0.16%

5.3th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
mozilla	firefox	< 151.2	151.2
mozilla	firefox_for_ios	< Firefox for iOS 151.2	Firefox for iOS 151.2

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.