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CVE-2026-9309 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2036573	[email protected]	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-53/	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	CISA-ADP

Affected Products

Product	Versions
mozilla firefox	< 151.2
CPE cpe:2.3:a:mozilla:firefox::::::iphone_os::* Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Jul 22, 2026	CVE Translated	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 3, 2026	Initial Analysis	[email protected]
Jun 1, 2026	CVE Modified	CISA-ADP
Jun 1, 2026	New CVE Received	[email protected]