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CVE-2026-20854

HIGH CVSS 3.1: 7.5 EPSS 0.07%
Updated Jan 15, 2026
Microsoft
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions before 10.0.26200.7623
Fixed In 10.0.26100.7623
Type CWE-416 (Use After Free)
Vendor Microsoft
Public PoC No

Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

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 3

Configuration From (including) Up to (excluding)
Microsoft Windows_11_24h2
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
10.0.26100.7623
Microsoft Windows_11_25h2
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*
10.0.26200.7623
Microsoft Windows_Server_2025
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
10.0.26100.32230