CVE-2026-9309

Arbitrary JavaScript execution in internal pages via Reader View JSON-LD injection

CVSS 5.4 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 5.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

01 jun 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Productos afectados

Mozilla · Firefox for iOS

Referencias

https://bugzilla.mozilla.org/show_bug.cgi?id=2036573 https://www.mozilla.org/security/advisories/mfsa2026-53/