CVE-2026-55136: CWE-822: Untrusted Pointer Dereference in Microsoft Microsoft 365 Apps for Enterprise
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-55136) is classified as CWE-822: Untrusted Pointer Dereference in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. It allows an unauthorized attacker to execute code locally by exploiting improper handling of pointers. The CVSS 3.1 base score is 7.8, indicating high severity with impact on confidentiality, integrity, and availability. The vulnerability affects version 16.0.1 of Microsoft 365 Apps for Enterprise. Microsoft has released an official fix and manages remediation for this cloud service. No active exploitation has been reported.
Potential Impact
Successful exploitation could lead to local code execution by an unauthorized attacker, impacting confidentiality, integrity, and availability of the affected system. The CVSS score of 7.8 reflects high impact. However, there are no known exploits in the wild currently.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55136 for detailed patching and update instructions.
CVE-2026-55136: CWE-822: Untrusted Pointer Dereference in Microsoft Microsoft 365 Apps for Enterprise
Description
Untrusted pointer dereference 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-2026-55136) is classified as CWE-822: Untrusted Pointer Dereference in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. It allows an unauthorized attacker to execute code locally by exploiting improper handling of pointers. The CVSS 3.1 base score is 7.8, indicating high severity with impact on confidentiality, integrity, and availability. The vulnerability affects version 16.0.1 of Microsoft 365 Apps for Enterprise. Microsoft has released an official fix and manages remediation for this cloud service. No active exploitation has been reported.
Potential Impact
Successful exploitation could lead to local code execution by an unauthorized attacker, impacting confidentiality, integrity, and availability of the affected system. The CVSS score of 7.8 reflects high impact. However, there are no known exploits in the wild currently.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should consult the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55136 for detailed patching and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T15:03:49.681Z
- 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-2026-55136","vendor":"Microsoft"}]
Threat ID: 6a5676b668715ace43f0ab86
Added to database: 07/14/2026, 17:49:42 UTC
Last enriched: 08/13/2026, 15:41:23 UTC
Last updated: 08/25/2026, 11:02:22 UTC
Views: 74
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