CVE-2026-66318
Received Received - Intake

Microsoft Edge Chromium Origin Validation Information Disclosure

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: Microsoft Corporation

Description
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-66318
EUVD
EUVD-2026-52521

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft edge *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-346 The product does not properly verify that the source of data or communication is valid.

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Executive Summary

This vulnerability is an origin validation error in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to disclose information over a network. It has a high impact on confidentiality and integrity but does not affect availability.

Impact Analysis

An attacker could exploit this to access sensitive information transmitted over the network. This may lead to data breaches, unauthorized access to user data, or other malicious activities depending on the information exposed.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, or other regulations due to unauthorized data disclosure. Organizations may face legal penalties, reputational damage, and loss of trust if sensitive data is exposed.

Mitigation Strategies

Update Microsoft Edge to the latest version immediately to patch the origin validation error. Disable unnecessary network services and restrict access to sensitive data until patched.

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