Spoofing Vulnerability in Microsoft Edge by Microsoft
CVE-2026-66316

5.4MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Edge (chromium-based)
Vendor
CVE Published:
3 August 2026

What is CVE-2026-66316?

An origin validation error in Microsoft Edge (Chromium-based) creates an opportunity for attackers to perform unauthorized spoofing attacks over a network. This vulnerability may allow malicious entities to impersonate legitimate entities, potentially leading to unauthorized access or data breaches. Users are encouraged to update their browser to the latest version to mitigate any risks associated with this vulnerability.

Affected Version(s)

Microsoft Edge (Chromium-based) 1.0.0.0 < 151.0.4129.59

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.