CVE-2026-20953: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20953) is classified as CWE-416 (Use After Free) and affects Microsoft 365 Apps for Enterprise version 16.0.1. It allows an unauthorized attacker to execute arbitrary code locally by exploiting a use-after-free condition in Microsoft Office. The CVSS v3.1 score is 8.4, indicating high severity, with attack vector local, low attack complexity, no privileges required, and no user interaction needed. The vulnerability impacts confidentiality, integrity, and availability. A patch is available from Microsoft to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system with high impact on confidentiality, integrity, and availability. This could lead to full compromise of the affected application environment. However, exploitation requires local access and no known public exploits are reported.
Mitigation Recommendations
A patch is available for this vulnerability. It is recommended to apply the official Microsoft update for Microsoft 365 Apps for Enterprise version 16.0.1 or later to remediate this issue. No additional mitigation steps are indicated.
CVE-2026-20953: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Description
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20953) is classified as CWE-416 (Use After Free) and affects Microsoft 365 Apps for Enterprise version 16.0.1. It allows an unauthorized attacker to execute arbitrary code locally by exploiting a use-after-free condition in Microsoft Office. The CVSS v3.1 score is 8.4, indicating high severity, with attack vector local, low attack complexity, no privileges required, and no user interaction needed. The vulnerability impacts confidentiality, integrity, and availability. A patch is available from Microsoft to remediate this issue.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system with high impact on confidentiality, integrity, and availability. This could lead to full compromise of the affected application environment. However, exploitation requires local access and no known public exploits are reported.
Mitigation Recommendations
A patch is available for this vulnerability. It is recommended to apply the official Microsoft update for Microsoft 365 Apps for Enterprise version 16.0.1 or later to remediate this issue. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-04T20:04:16.340Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69668ae5a60475309f9ae241
Added to database: 1/13/2026, 6:11:49 PM
Last enriched: 4/3/2026, 12:52:23 PM
Last updated: 5/9/2026, 6:23:41 AM
Views: 188
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