---
id: CVE-2026-66798
title: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
summary: >-
  Use after free in Microsoft Edge (Chromium-based) allows an unauthorized
  attacker to execute code over a network.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-416
vendor: Microsoft
product: Microsoft Edge (Chromium-based)
affected:
  - edge_chromium-based -
  - edge_for_android >= 1.0.0.0 < 152.0.4191.52
  - edge_for_ios >= 1.0.0.0 < 152.0.4191.52
  - edge_for_linux >= 1.0.0 < 152.0.4191.52
  - edge_for_mac >= 1.0.0.0 < 152.0.4191.52
  - edge_for_windows >= 1.0.0.0 < 152.0.4191.52
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-29T03:56:13.736994Z'
published: '2026-08-28'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:39:11.548Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-66798'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66798'
    label: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.00786
epssPercentile: 0.54253
ingestedAt: '2026-09-14T00:35:28.548Z'
---

## Overview

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

## Affected

- `edge_chromium-based -`
- `edge_for_android >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_ios >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_linux >= 1.0.0 < 152.0.4191.52`
- `edge_for_mac >= 1.0.0.0 < 152.0.4191.52`
- `edge_for_windows >= 1.0.0.0 < 152.0.4191.52`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.