CVE-2026-55033: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft 365 Apps for Enterprise
Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-55033) involves an integer overflow or wraparound in Microsoft Office Word, part of Microsoft 365 Apps for Enterprise. It allows local code execution by an unauthorized attacker. The CVSS 3.1 vector indicates low attack complexity and no privileges required, but user interaction is needed. The vulnerability impacts confidentiality, integrity, and availability with high severity. Microsoft has released an official fix and manages remediation for the cloud-hosted service. The affected version explicitly stated is 16.0.1.
Potential Impact
Successful exploitation could lead to local code execution by an unauthorized attacker, impacting confidentiality, integrity, and availability of the affected system. The vulnerability is rated high severity with a CVSS score of 7.8. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55033 to apply the official fix.
CVE-2026-55033: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft 365 Apps for Enterprise
Description
Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to execute code locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-55033) involves an integer overflow or wraparound in Microsoft Office Word, part of Microsoft 365 Apps for Enterprise. It allows local code execution by an unauthorized attacker. The CVSS 3.1 vector indicates low attack complexity and no privileges required, but user interaction is needed. The vulnerability impacts confidentiality, integrity, and availability with high severity. Microsoft has released an official fix and manages remediation for the cloud-hosted service. The affected version explicitly stated is 16.0.1.
Potential Impact
Successful exploitation could lead to local code execution by an unauthorized attacker, impacting confidentiality, integrity, and availability of the affected system. The vulnerability is rated high severity with a CVSS score of 7.8. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55033 to apply the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:13:49.835Z
- 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-2026-55033","vendor":"Microsoft"}]
Threat ID: 6a5676b068715ace43f098bf
Added to database: 07/14/2026, 17:49:36 UTC
Last enriched: 08/13/2026, 15:32:27 UTC
Last updated: 08/28/2026, 22:52:12 UTC
Views: 72
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