CVE-2026-55044: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-55044) involves an out-of-bounds read in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. The flaw allows unauthorized local code execution, posing a high impact on confidentiality, integrity, and availability. The CVSS 3.1 vector indicates low attack complexity, no privileges required, but user interaction is needed. Microsoft has published an official fix and manages remediation for this cloud service. The affected version explicitly includes 16.0.1.
Potential Impact
Successful exploitation can lead to local code execution by an unauthorized attacker, impacting system confidentiality, integrity, and availability. The vulnerability is rated high severity with a CVSS score of 7.8. No active exploitation has been reported so far.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should apply the official update as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55044 to mitigate this vulnerability.
CVE-2026-55044: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Description
Out-of-bounds read in Microsoft Office Excel 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-2026-55044) involves an out-of-bounds read in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. The flaw allows unauthorized local code execution, posing a high impact on confidentiality, integrity, and availability. The CVSS 3.1 vector indicates low attack complexity, no privileges required, but user interaction is needed. Microsoft has published an official fix and manages remediation for this cloud service. The affected version explicitly includes 16.0.1.
Potential Impact
Successful exploitation can lead to local code execution by an unauthorized attacker, impacting system confidentiality, integrity, and availability. The vulnerability is rated high severity with a CVSS score of 7.8. No active exploitation has been reported so far.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should apply the official update as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55044 to mitigate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:13:49.836Z
- 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-2026-55044","vendor":"Microsoft"}]
Threat ID: 6a5676b168715ace43f0993d
Added to database: 07/14/2026, 17:49:37 UTC
Last enriched: 08/13/2026, 15:34:33 UTC
Last updated: 08/25/2026, 22:52:12 UTC
Views: 47
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