CVE-2026-66798

Analyzed Analyzed - Analysis Complete

Use After Free in Microsoft Edge Chromium

Publication date: 2026-08-28

Last updated on: 2026-09-11

Assigner: Microsoft Corporation

Description

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-28

Last Modified

2026-09-11

Generated

2026-09-18

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-66798

EUVD

EUVD-2026-67851

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	edge_chromium	to 152.0.4191.53 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to execute code remotely over a network.

Detection Guidance

This vulnerability is specific to Microsoft Edge (Chromium-based) and requires patching or updating the browser to the latest version. No direct detection commands are provided in the available resources. Ensure your Microsoft Edge browser is updated to the latest version to mitigate this issue.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially leading to data theft, system compromise, or further network attacks.

Compliance Impact

This vulnerability allows remote code execution, which could lead to unauthorized access or data breaches. Such incidents may violate compliance requirements under GDPR or HIPAA if sensitive data is exposed or mishandled.

Mitigation Strategies

Apply the latest security updates from Microsoft for Microsoft Edge (Chromium-based) as soon as possible to patch the use-after-free vulnerability.

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