CVE-2026-9308
Analyzed Analyzed - Analysis Complete
Firefox for iOS Reader View DOM-based XSS via JSON-LD injection

Publication date: 2026-06-01

Last updated on: 2026-06-03

Assigner: Mozilla Corporation

Description
Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was fixed in Firefox for iOS 151.2.
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Meta Information
Published
2026-06-01
Last Modified
2026-06-03
Generated
2026-06-21
AI Q&A
2026-06-01
EPSS Evaluated
2026-06-20
NVD
CVE-2026-9308
EUVD
EUVD-2026-33629
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox to 151.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

This vulnerability occurs in Firefox for iOS Reader View, where the page content was replaced in its HTML template before other internal placeholders were substituted. A malicious web page could include a placeholder string that would later be replaced with JSON-LD data, which could lead to arbitrary JavaScript execution.

Impact Analysis

The vulnerability could allow an attacker to execute arbitrary JavaScript code within the context of the affected application. This could lead to unauthorized actions, data theft, or other malicious activities performed by the attacker.

Mitigation Strategies

To mitigate this vulnerability, update Firefox for iOS to version 151.2 or later, where the issue has been fixed.

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