CVE-2026-83951

MEDIUM CVSS 3.1: 5.5 EPSS 0.40%
Updated Sep 08, 2026
Microsoft
Parameter Value
CVSS 5.5 (MEDIUM)
Affected Versions 16.0.0 — 16.0.5569.1000
Fixed In 16.0.5569.1000
Type CWE-126
Vendor Microsoft
Public PoC No

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Attack Parameters

Attack Vector
Local
Requires local access
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
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 15

Configuration From (including) Up to (excluding)
Microsoft Word_2016
cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*
16.0.1 16.0.5569.1000
Microsoft Office_2019
cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*
19.0.0 16.0.10417.20207
Microsoft Office_2021
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
16.0.1 16.0.14334.20906
Microsoft Office_2024
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
16.0.0 16.0.17932.20976
Microsoft 365_Apps
cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
16.0.1 16.0.20326.20138
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_2019
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
Microsoft Office_2019
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
Microsoft Office_2021
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
Microsoft Office_2021
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
Microsoft Office_2024
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
Microsoft Office_2024
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
Microsoft Word
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
Microsoft Word
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*