Type Confusion Vulnerability in Microsoft Edge by Microsoft
CVE-2026-66321

7.4HIGH

Key Information:

Vendor

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

What is CVE-2026-66321?

A vulnerability in Microsoft Edge (Chromium-based) involves a type confusion issue that could allow an attacker to execute arbitrary code remotely. This occurs when incompatible data types are accessed, leading to potential exploitation through network communications. This flaw underscores the importance of applying security updates promptly to mitigate risks associated with unauthorized code execution.

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:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.