EUVD-2026-44221
GHSA-5wrg-wv69-274m
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File must be opened locally by a user (AV:L, UI:R) with no prior privileges (PR:N); memory-corruption code execution grants full C/I/A impact within the user context.
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 PowerPoint allows an unauthorized attacker to execute code locally.
AnalysisAI
Arbitrary code execution in Microsoft PowerPoint (and the broader Microsoft Office/365 suite on Windows and macOS) arises from a heap-based buffer overflow (CWE-122) triggered when a victim opens a maliciously crafted presentation file. An attacker who cannot log in to the target can still run code in the context of the current user by convincing that user to open the booby-trapped file, giving full confidentiality, integrity, and availability impact on the affected 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 PowerPoint/Office presentation file - user interaction (UI:R) is mandatory and is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H yields 7.8 (High): local attack vector, low complexity, no privileges, but mandatory user interaction, with high impact to all three security properties. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or shares a specially crafted PowerPoint presentation and lures a user into opening it, for example as a fake meeting deck or invoice slide. When PowerPoint parses the malformed structure, the heap overflow corrupts memory and executes attacker-supplied code in the user's security context. … |
| Remediation | Apply the Microsoft-released security update for your Office channel - patch availability is confirmed by the vendor, though exact fixed build numbers were not provided in this data set; obtain them from the advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55120 and deploy via Microsoft Update, Click-to-Run, or your patch-management pipeline. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all PowerPoint and Office 365 deployments across Windows and macOS; advise users to avoid opening files from untrusted sources. …
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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
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-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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