EUVD-2026-44155
GHSA-r8f5-8f3p-vxp4
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Client-side document parsing bug: attacker needs no auth (PR:N) but victim must open the file (UI:R, AV:L), and successful memory corruption yields full C/I/A compromise as the user.
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
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office (Microsoft 365 Apps for Enterprise, Office 2016/2019, and Office LTSC 2021/2024) arises from a heap-based buffer overflow (CWE-122) that an attacker triggers by convincing a user to open a maliciously crafted Office document. Successful exploitation yields full code execution in the context of the current user, with high impact to confidentiality, integrity, and availability. …
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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 in an affected build of Microsoft Office (365 Apps for Enterprise, Office 2016/2019, or Office LTSC 2021/2024) - the CVSS UI:R confirms user interaction is mandatory, which is the primary limiting factor. … 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 - the 'local' attack vector here reflects that the victim must open a file (UI:R), not that the attacker needs prior local access, which is typical for document-parsing bugs. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document with a corrupted structure that overflows a heap buffer during parsing, then delivers it via phishing email or a web download. When the targeted user opens the file (and, if prompted, exits Protected View), the overflow executes attacker-controlled code with that user's privileges. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50301 from the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50301, which lists the fixed build for each affected channel (Microsoft 365 Apps for Enterprise, Office 2016, Office 2019, Office LTSC 2021, and Office LTSC 2024); the input does not specify an exact fixed version, so pull the precise build from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all affected Microsoft Office installations (Microsoft 365 Apps for Enterprise, Office 2016, Office 2019, Office LTSC 2021, Office LTSC 2024) and communicate heightened document security awareness to users; expedite patch procurement. …
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Local code execution in Microsoft Office (including Microsoft 365 Apps for Enterprise, Office 2016/2019, and Office LTSC
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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-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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