CVE-2026-66321

CRITICAL CVSS 3.1: 9.6 EPSS 0.94%
Updated Aug 06, 2026
Microsoft
Parameter Value
CVSS 9.6 (CRITICAL)
Affected Versions 1.0.0.0 — 151.0.4129.59
Fixed In 151.0.4129.59
Type CWE-843 (Type Confusion)
Vendor Microsoft
Public PoC No

Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Microsoft Edge_Chromium
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
1.0.0.0 151.0.4129.59