CVE-2026-102855: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Description
CVE-2026-102855 is a heap-based buffer overflow vulnerability in Microsoft Office Visio, part of Microsoft 365 Apps for Enterprise. This flaw allows an unauthorized attacker to execute code remotely over a network. The vulnerability has a high severity score of 8.8 and affects specific versions of Microsoft 365 Apps for Enterprise. An official fix is available from Microsoft.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft 365 Apps for Enterprise
Microsoft
Microsoft Office LTSC 2021
Microsoft
Microsoft Office LTSC 2024
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-102855) involves a heap-based buffer overflow in Microsoft Office Visio within Microsoft 365 Apps for Enterprise. Exploitation could allow an attacker to execute arbitrary code remotely without privileges, requiring user interaction. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The vendor has issued an official fix and manages remediation for this cloud-hosted service. The affected versions include =16.0.1, >=16.0.1 <16.0.14334.20974, and >=16.0.0 <16.0.17932.21056.
Potential Impact
Successful exploitation could result in remote code execution with high impact on confidentiality, integrity, and availability of the affected system. The vulnerability requires no privileges but does require user interaction. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the provided patches as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102855. Since this is a cloud service, Microsoft manages remediation server-side. Confirm patch status via the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-29T17:27:07.498Z
- 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-2026-102855","vendor":"Microsoft"}]
Threat ID: 6ace881c2cdf04f656a23526
Added to database: 10/13/2026, 19:35:56 UTC
Last enriched: 10/13/2026, 19:48:36 UTC
Last updated: 10/13/2026, 19:51:05 UTC
Views: 4
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