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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-01

Last Modified

2026-06-03

Generated

2026-07-12

AI Q&A

2026-06-01

EPSS Evaluated

2026-07-10

NVD

CVE-2026-9308

EUVD

EUVD-2026-33629

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 151.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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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