CVE-2026-109772

Received Received - Intake

Same-origin policy bypass in Firefox DevTools

Publication date: 2026-10-13

Last updated on: 2026-10-26

Assigner: Mozilla Corporation

Description

Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-26

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-109772

EUVD

EUVD-2026-98532

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	158

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 vulnerability is a same-origin policy bypass in Firefox's DevTools component. The same-origin policy is a security feature that prevents scripts from one website from accessing data from another website. A bypass means an attacker could potentially access sensitive data across different origins.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access sensitive information from other websites while you are using Firefox DevTools. This might lead to data theft, session hijacking, or unauthorized actions on your behalf.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, which may violate GDPR's data protection requirements. For HIPAA, it might expose protected health information, risking compliance with patient privacy rules.

Mitigation Strategies

Update Firefox to version 158 or later to address the same-origin policy bypass in the DevTools component.

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