---
id: CVE-2026-57978
title: >-
  Origin validation error in Microsoft Edge (Chromium-based) allows an
  unauthorized attacker to perform spoofing over a network.
summary: >-
  Origin validation error in Microsoft Edge (Chromium-based) allows an
  unauthorized attacker to perform spoofing 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-346
published: '2026-07-26'
updated: '2026-07-26'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57978'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57978'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-07-26T19:13:36.736Z'
epss: 0.00212
epssPercentile: 0.10146
vendor: Microsoft
product: Microsoft Edge (Chromium-based)
affected:
  - edge_chromium-based >= 1.0.0.0 < 150.0.4078.99
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-27T17:23:52.647028Z'
---

## Overview

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

## Remediation

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