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CVE-2026-20953

HIGH CVSS 3.1: 8.4 EPSS 0.02%
Updated Jan 14, 2026
Microsoft
Parameter Value
CVSS 8.4 (HIGH)
Type CWE-416 (Use After Free)
Vendor Microsoft
Public PoC No

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No 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 12

Configuration From (including) Up to (excluding)
Microsoft 365_Apps
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
Microsoft 365_Apps
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
Microsoft Office
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:*
Microsoft Office
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:*
Microsoft Office
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*
Microsoft Office
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*
Microsoft Office_Long_Term_Servicing_Channel
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*