---
id: CVE-2026-66323
title: >-
  Improper neutralization of parameter/argument delimiters in Microsoft Edge
  (Chromium-based) allows an unauthorized attacker to execute code over a
  network.
summary: >-
  Improper neutralization of parameter/argument delimiters in Microsoft Edge
  (Chromium-based) allows an unauthorized attacker to execute code over a
  network.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-141
vendor: microsoft
product: edge_chromium
affected:
  - edge_chromium < 152.0.4191.53
patched:
  - edge_chromium 152.0.4191.53
published: '2026-08-28'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T17:17:43.033'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66323'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66323'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-29T03:56:14.787611Z'
epss: 0.00413
epssPercentile: 0.32839
ingestedAt: '2026-08-30T07:49:06.491Z'
---

## Overview

Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

## Affected

- `edge_chromium < 152.0.4191.53`

## Remediation

Upgrade past the affected range:

- `edge_chromium 152.0.4191.53`