CVE-2026-50387: CWE-121: Stack-based Buffer Overflow in Microsoft Microsoft Office 365 for Mac
CVE-2026-50387 is a stack-based buffer overflow vulnerability in Microsoft Office 365 for Mac related to Windows GDI components. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity CVSS score of 7.8. An official fix is available, and since this is a cloud service, Microsoft manages the remediation. No known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-50387) is a stack-based buffer overflow (CWE-121) affecting Microsoft Office 365 for Mac, specifically involving Windows GDI. It enables an authorized local attacker to elevate privileges on the affected system. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The vendor has released an official fix, and as this is a cloud service, Microsoft manages patch deployment. No public exploits have been observed.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. This could compromise confidentiality, integrity, and availability of affected systems running Microsoft Office 365 for Mac.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft Office 365 for Mac is a cloud service, Microsoft manages the remediation and patch deployment. Users and administrators should ensure their systems are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50387.
CVE-2026-50387: CWE-121: Stack-based Buffer Overflow in Microsoft Microsoft Office 365 for Mac
Description
CVE-2026-50387 is a stack-based buffer overflow vulnerability in Microsoft Office 365 for Mac related to Windows GDI components. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity CVSS score of 7.8. An official fix is available, and since this is a cloud service, Microsoft manages the remediation. No known exploits are reported in the wild.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-50387) is a stack-based buffer overflow (CWE-121) affecting Microsoft Office 365 for Mac, specifically involving Windows GDI. It enables an authorized local attacker to elevate privileges on the affected system. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The vendor has released an official fix, and as this is a cloud service, Microsoft manages patch deployment. No public exploits have been observed.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. This could compromise confidentiality, integrity, and availability of affected systems running Microsoft Office 365 for Mac.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft Office 365 for Mac is a cloud service, Microsoft manages the remediation and patch deployment. Users and administrators should ensure their systems are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50387.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-04T18:55:14.745Z
- 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-2026-50387","vendor":"Microsoft"}]
Threat ID: 6a56769768715ace43f08e40
Added to database: 07/14/2026, 17:49:11 UTC
Last enriched: 07/15/2026, 00:04:24 UTC
Last updated: 07/15/2026, 00:04:24 UTC
Views: 2
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