CVE-2026-70309 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Microsoft Subscribe	Edge Chromium Subscribe

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OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309

History

Fri, 28 Aug 2026 22:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 28 Aug 2026 19:45:00 +0000

Type	Values Removed	Values Added
Description		Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.
Title		Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability
First Time appeared		Microsoft Microsoft edge Chromium
Weaknesses		CWE-346
CPEs		cpe:2.3:a:microsoft:edge_chromium::::::::
Vendors & Products		Microsoft Microsoft edge Chromium
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309
Metrics		cvssV3_1 `{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-08-28T17:45:35.711Z

Updated: 2026-08-28T20:14:38.366Z

Reserved: 2026-08-04T00:01:20.932Z

Link: CVE-2026-70309

Vulnrichment

Updated: 2026-08-28T20:14:34.962Z

NVD

Status : Awaiting Analysis

Published: 2026-08-28T20:19:40.267

Modified: 2026-08-28T22:16:52.767

Link: CVE-2026-70309

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-28T21:30:05Z

Weaknesses

CWE-346

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