---
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
  - CWE-77
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: '2026-10-21'
sourceUpdated: '2026-10-21T20:54:56.722Z'
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
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-66798.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-66798'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507993'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-66798'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66798'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60387'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60390'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60388'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60389'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60391'
  - url: 'https://access.redhat.com/errata/RHSA-2026:60386'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00786
epssPercentile: 0.55922
patched:
  - advanced_cluster_management_for_kubernetes 2.11
  - advanced_cluster_management_for_kubernetes 2.13
  - advanced_cluster_management_for_kubernetes 2.14
  - advanced_cluster_management_for_kubernetes 2.15
  - advanced_cluster_management_for_kubernetes 2.16
  - advanced_cluster_management_for_kubernetes 2.17
scores:
  cna: 4.3
  vendor: 8.8
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.

## Vendor advisories

- **RHSA-2026:60387** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.11 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60387)
- **RHSA-2026:60390** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.13 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60390)
- **RHSA-2026:60388** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.14 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60388)
- **RHSA-2026:60389** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.15 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60389)
- **RHSA-2026:60391** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60391)
- **RHSA-2026:60386** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60386)