CVE-2026-92034

Analyzed Analyzed - Analysis Complete

Graphics Component Site Isolation Vulnerability in Firefox

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-06

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92034

EUVD

EUVD-2026-78497

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 156.0.0 (exc)
mozilla	thunderbird	to 156.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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 different websites into different processes to prevent data leaks between them. A flaw in this feature could allow malicious websites to access data from other sites.

Detection Guidance

This vulnerability is specific to Firefox 156 and Thunderbird 156, so detection involves checking the installed version of these applications. If you are running an affected version, updating to Firefox 156 or Thunderbird 156 or later will resolve the issue.

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. This could lead to identity theft, unauthorized account access, or data breaches.

Mitigation Strategies

Update Firefox to version 156 or later to address the Site isolation issue in the Graphics component.

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