CVE-2026-9309

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

5.4 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

June 01, 2026

Last Modified

June 03, 2026

CWE ID

CWE-79

Source

NVD

Vendor

mozilla

Product

firefox

External References

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

CVE-2026-9309

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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