CVE-2026-50387: CWE-121: Stack-based Buffer Overflow in Microsoft Microsoft Office 365 for Mac
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-50387) involves a stack-based buffer overflow in Windows GDI within Microsoft Office 365 for Mac. The flaw enables an authorized attacker with local access to escalate privileges on the affected system. The CVSS 3.1 score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud-hosted service. There are no known exploits in the wild at this time.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. The impact includes full compromise of confidentiality, integrity, and availability of affected components.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft Office 365 for Mac is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure that their environments 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
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
pkg:github/microsoft/office-365-for-macRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-50387) involves a stack-based buffer overflow in Windows GDI within Microsoft Office 365 for Mac. The flaw enables an authorized attacker with local access to escalate privileges on the affected system. The CVSS 3.1 score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud-hosted service. There are no known exploits in the wild at this time.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. The impact includes full compromise of confidentiality, integrity, and availability of affected components.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft Office 365 for Mac is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure that their environments 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: 08/13/2026, 14:45:35 UTC
Last updated: 08/26/2026, 03:23:17 UTC
Views: 86
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