CVE-2026-45456: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Microsoft 365 Apps for Enterprise
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-843 (Access of Resource Using Incompatible Type or 'Type Confusion'), affects Microsoft 365 Apps for Enterprise version 16.0.1. It allows an unauthorized attacker to execute code locally by exploiting improper handling of resource types. The CVSS v3.1 score is 8.4, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation can lead to local code execution without user interaction or privileges, resulting in full compromise of confidentiality, integrity, and availability of the affected system. This poses a significant risk to affected environments.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should consult the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456 for detailed patching and update instructions.
CVE-2026-45456: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Microsoft 365 Apps for Enterprise
Description
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
CVSS v3.1
Score 8.4high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-843 (Access of Resource Using Incompatible Type or 'Type Confusion'), affects Microsoft 365 Apps for Enterprise version 16.0.1. It allows an unauthorized attacker to execute code locally by exploiting improper handling of resource types. The CVSS v3.1 score is 8.4, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation can lead to local code execution without user interaction or privileges, resulting in full compromise of confidentiality, integrity, and availability of the affected system. This poses a significant risk to affected environments.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should consult the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456 for detailed patching and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T16:06:43.097Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456","vendor":"Microsoft"}]
Threat ID: 6a284cd78dd33fbd85664c01
Added to database: 06/09/2026, 17:26:47 UTC
Last enriched: 07/29/2026, 21:54:27 UTC
Last updated: 07/31/2026, 21:26:44 UTC
Views: 82
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