EUVD-2026-44157
GHSA-87hp-rggg-4jgw
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 and UI:R; no attacker privileges needed (PR:N); code runs as the user with full C/I/A impact and no scope change.
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 allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office (2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024) arises from a use-after-free memory corruption flaw that an attacker triggers by convincing a user to open a maliciously crafted Office document. Successful exploitation runs arbitrary code in the context of the current user, yielding full confidentiality, integrity, and availability impact on the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open an attacker-supplied malicious Office document on the local machine (AV:L with UI:R) - the attacker cannot trigger the flaw remotely without user action. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - local attack vector, low complexity, no privileges required, but mandatory user interaction (opening a file). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a crafted Office document (or hosts it on a web/file share) and uses social engineering to get a target to open it; the file contains malformed structures that trigger the use-after-free, corrupting the heap and executing attacker code in the user's security context. No public exploit is identified at time of analysis, and exploitation requires the victim to open the file (UI:R) rather than any remote trigger. |
| Remediation | Apply the Microsoft-released update for your Office channel as the primary fix - Patch available per vendor advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50467); ensure Microsoft 365 Apps and Office 2016/2019/LTSC 2021/LTSC 2024 on Windows and the Office for Mac 2021/2024 builds all receive the corresponding security update, and confirm the exact patched build number from the MSRC page since the input did not specify one. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Office installations across the organization (versions 2016, 2019, LTSC 2021/2024, Microsoft 365 Apps, and Office for Mac 2021/2024), notify users to avoid opening documents from untrusted sources, and restrict external file sharing until patches are deployed. …
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Local code execution in Microsoft Word (and the wider Microsoft Office / Microsoft 365 Apps family) lets an unauthorized
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Local code execution in Microsoft Word (Office 2016/2019, Microsoft 365 Apps, Office LTSC 2021/2024) arises from a heap-
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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