CVE-2026-55026: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft 365 Apps for Enterprise
Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability involves an integer overflow or wraparound condition in Microsoft 365 Apps for Enterprise (version 16.0.1). It enables an unauthorized attacker with local access to disclose information. The issue is tracked as CWE-190. Microsoft has published an official fix and manages remediation for this cloud service. The CVSS 3.1 base score is 6.2, reflecting a medium severity with high confidentiality impact but no integrity or availability impact. No active exploitation has been reported.
Potential Impact
An attacker with local access can exploit this integer overflow vulnerability to disclose sensitive information. The confidentiality impact is high, but integrity and availability are not affected. There are no reports of active exploitation in the wild.
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 refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55026 for update and patch deployment guidance.
CVE-2026-55026: CWE-190: Integer Overflow or Wraparound in Microsoft Microsoft 365 Apps for Enterprise
Description
Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 6.2medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer overflow or wraparound condition in Microsoft 365 Apps for Enterprise (version 16.0.1). It enables an unauthorized attacker with local access to disclose information. The issue is tracked as CWE-190. Microsoft has published an official fix and manages remediation for this cloud service. The CVSS 3.1 base score is 6.2, reflecting a medium severity with high confidentiality impact but no integrity or availability impact. No active exploitation has been reported.
Potential Impact
An attacker with local access can exploit this integer overflow vulnerability to disclose sensitive information. The confidentiality impact is high, but integrity and availability are not affected. There are no reports of active exploitation in the wild.
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 refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55026 for update and patch deployment guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:12:44.285Z
- 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-2026-55026","vendor":"Microsoft"}]
Threat ID: 6a5676af68715ace43f09888
Added to database: 07/14/2026, 17:49:35 UTC
Last enriched: 08/13/2026, 15:31:00 UTC
Last updated: 08/27/2026, 22:52:12 UTC
Views: 56
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