CVE-2026-70309

Received Received - Intake

Microsoft Edge Origin Validation Bypass Vulnerability

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: Microsoft Corporation

Description

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-28

Last Modified

2026-08-28

Generated

2026-08-29

AI Q&A

2026-08-29

EPSS Evaluated

N/A

NVD

CVE-2026-70309

EUVD

EUVD-2026-67853

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	edge	*

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 security feature bypass in Microsoft Edge (Chromium-based) caused by an origin validation error. An unauthorized attacker can exploit it over a network to bypass a security feature.

Impact Analysis

An attacker could bypass security protections, potentially accessing restricted data or performing unauthorized actions. This may lead to data leaks or other malicious activities depending on the bypassed feature.

Mitigation Strategies

Apply the latest security updates from Microsoft for Microsoft Edge (Chromium-based) to address the origin validation error. Monitor Microsoft's official advisory for patches and follow their recommended mitigation steps.

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