EUVD-2026-44156
GHSA-7938-fgc9-gw6v
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local document-open attack requires user interaction (AV:L/UI:R) with no prior privileges (PR:N); successful UAF yields full code execution as the user, so C/I/A all High.
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 the macOS editions) arises from a use-after-free memory-corruption flaw (CWE-416) that lets an attacker run arbitrary code in the context of the current user after the victim opens a maliciously crafted document. The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:N/UI:R) with high impact to confidentiality, integrity, and availability, and requires user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a victim to open a specially crafted Office document (Word/Excel/PowerPoint/OLE) on an affected build - the CVSS UI:R metric makes user interaction mandatory, so this cannot be triggered without the target opening the malicious file. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderate-to-serious but not emergency-tier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document that triggers the use-after-free during parsing and delivers it via phishing email or a download link. When the victim opens the file and enables editing/content, the dangling pointer is exploited to execute code in the user's security context, enabling malware installation or data theft. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft update for your Office channel as published on the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50314; exact fixed build numbers are not included in the supplied data and should be taken from that advisory per product (Microsoft 365 Apps auto-update channel, Office LTSC/2016/2019 via Microsoft Update or Click-to-Run, and the macOS builds via Microsoft AutoUpdate). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, issue a security advisory to all staff regarding suspicious email attachments and identify all Office installations by version across the organization. …
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Local code execution in Microsoft Word (and Office/SharePoint components that render Word content) stems from an integer
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)
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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