Vulnerability Intelligence Report
Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-88156
Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-121 ↗CWE-121: Stack-based Buffer Overflow
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 < https://aka.ms/OfficeSecurityReleases (affected) |
| Microsoft | Microsoft Office 365 for Mac | 1.0.0 < publication (affected) |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 < 16.0.14334.20974 (affected) |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 < 16.0.17932.21056 (affected) |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 < publication (affected) |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 < publication (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-09-09T21:58:19 |
| Published | 2026-10-13T19:00:29 |
| Patch Date | 2026-10-13 |
| Last Updated | 2026-10-14T03:56:59 |
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