CVE-2026-55123: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Heap-based buffer overflow in Microsoft Office PowerPoint allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-55123) involves a heap-based buffer overflow in Microsoft Office PowerPoint as part of Microsoft 365 Apps for Enterprise. It enables an unauthorized attacker to execute arbitrary code locally, potentially leading to full compromise of confidentiality, integrity, and availability. The CVSS 3.1 score is 7.8, reflecting high impact with low attack complexity but requiring user interaction. Microsoft has issued an official fix and manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation allows local code execution with high impact on confidentiality, integrity, and availability of the affected system. This could lead to full system compromise if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft 365 Apps for Enterprise is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their environments are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55123.
CVE-2026-55123: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Description
Heap-based buffer overflow in Microsoft Office PowerPoint 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-2026-55123) involves a heap-based buffer overflow in Microsoft Office PowerPoint as part of Microsoft 365 Apps for Enterprise. It enables an unauthorized attacker to execute arbitrary code locally, potentially leading to full compromise of confidentiality, integrity, and availability. The CVSS 3.1 score is 7.8, reflecting high impact with low attack complexity but requiring user interaction. Microsoft has issued an official fix and manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation allows local code execution with high impact on confidentiality, integrity, and availability of the affected system. This could lead to full system compromise if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft 365 Apps for Enterprise is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their environments are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55123.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T15:03:49.680Z
- 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-2026-55123","vendor":"Microsoft"}]
Threat ID: 6a5676b568715ace43f0ab07
Added to database: 07/14/2026, 17:49:41 UTC
Last enriched: 07/14/2026, 19:18:30 UTC
Last updated: 07/15/2026, 01:27:20 UTC
Views: 2
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