EUVD-2026-44214
GHSA-6f4x-v88v-3f2g
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-open vector so AV:L with mandatory UI:R; no privileges needed (PR:N) and low complexity, with full code execution in user context giving C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office Word (CWE-416 use-after-free) allows an unauthorized attacker to run arbitrary code in the context of the current user when a victim opens a maliciously crafted document. The flaw affects a broad Office footprint including Microsoft 365 Apps for Enterprise, Office 2019, Office LTSC 2021/2024 (Windows and Mac), and related SharePoint Server products that process Word documents. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open or preview an attacker-crafted Word document - the CVSS UI:R flag confirms mandatory user interaction, which is the key limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H): local attack vector, low complexity, no privileges, but user interaction required, yielding full high impact to confidentiality, integrity, and availability within the user's context. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or hosts a specially crafted Word document and lures a victim into opening it (e.g., an invoice or resume lure). On open, Word's parser triggers the use-after-free, the attacker-controlled memory reuse hijacks execution, and arbitrary code runs with the victim's privileges - enabling malware installation or credential theft. … |
| Remediation | Apply the Microsoft security update for CVE-2026-55128 as the primary fix - Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55128; for Microsoft 365 Apps and Click-to-Run channels ensure automatic updates are current, and for Office 2019/LTSC and SharePoint deploy the corresponding monthly security update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all deployed Microsoft Office versions (365 Apps for Enterprise, Office 2019, Office LTSC 2021, Office LTSC 2024) across Windows and macOS endpoints to understand the scope of affected systems. …
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Local code execution in Microsoft Word (and Office/SharePoint components that render Word content) stems from an integer
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and the macOS editions) arises
Arbitrary code execution in Microsoft Office Word (and the broader Office/365/SharePoint family) arises from a stack-bas
Local code execution in Microsoft Office (including Microsoft 365 Apps for Enterprise, Office 2016/2019, and Office LTSC
Local code execution in Microsoft Word (part of Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, and Office for M
Local arbitrary code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and O
Arbitrary code execution in Microsoft PowerPoint (and the broader Microsoft Office/365 suite on Windows and macOS) arise
Local code execution in Microsoft Office PowerPoint (including Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, a
Local code execution in Microsoft Office PowerPoint (CWE-122 heap-based buffer overflow) lets an unauthorized attacker r
Local code execution in Microsoft Word (and the wider Microsoft Office / Microsoft 365 Apps family) lets an unauthorized
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps for Enterprise, and Office for
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024)
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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