EUVD-2026-44201
GHSA-wccm-7wfc-h3w3
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-open client RCE: AV:L and UI:R because the victim must open a crafted document, PR:N as no auth is needed, and full C/I/A High from arbitrary code execution.
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
Double free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Word (part of Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, and Office for Mac) stems from a double free of heap memory (CWE-415) that lets an unauthorized attacker run arbitrary code when a victim opens a malicious document. The flaw was reported by Microsoft, carries CVSS 7.8, and a vendor patch is available; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a maliciously crafted Word document in an affected Office/SharePoint build - the user-interaction (UI:R) step is the primary gate, and no attacker authentication is needed (PR:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 7.8) describes a classic client-side RCE: no privileges needed but the victim must open a file, and impact to confidentiality, integrity, and availability is High within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a weaponized Word document (or hosts it on a SharePoint/web link) to a targeted user; when the victim opens it, the double-free corrupts heap memory and executes attacker-controlled shellcode in the user's Office context, giving foothold for further malware or lateral movement. Because AC:L, exploitation is reliable once triggered, but UI:R means the campaign depends on social engineering to get the file opened. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55132 for each affected SKU (Microsoft 365 Apps via Click-to-Run channel updates, Office LTSC 2021/2024 and Office 2019 via the corresponding MSI/Click-to-Run packages, Office for Mac via AutoUpdate, and SharePoint 2016/2019/Subscription Edition server updates); the advisory contains the exact fixed build numbers, which are not reproduced in the input data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running affected Office versions (Office 2019, Office LTSC 2021/2024, Microsoft 365 Apps, Office for Mac) and communicate patch availability to stakeholders with emphasis on restricting opening documents from untrusted sources until patched. …
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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 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-415 – Double Free
View allSame technique Authentication Bypass
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External POC / Exploit Code
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