CVE-2026-16398

Analyzed Analyzed - Analysis Complete

Graphics Component Site Isolation Vulnerability in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-21

Last Modified

2026-07-24

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16398

EUVD

EUVD-2026-46236

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	to 153.0 (exc)
mozilla	firefox	to 153.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-346	The product does not properly verify that the source of data or communication is valid.

Attack-Flow Graph

Executive Summary

This is a site isolation issue in Firefox's Graphics component. Site isolation is a security feature that separates content from different websites to prevent malicious sites from accessing data from other sites. A flaw in this feature could allow unauthorized access or data leakage between sites.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access sensitive data from other websites you have open in your browser, such as login credentials, personal information, or financial details. It may also enable cross-site scripting attacks or data theft.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating privacy requirements under GDPR and HIPAA. Organizations using affected Firefox versions may face compliance violations, legal penalties, and reputational damage if user data is compromised.

Mitigation Strategies

Update Firefox to version 153 or later to address the graphics component site isolation issue.

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