EUVD-2026-44160
GHSA-gmj3-jv2h-3mhj
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-borne exploitation is local (AV:L) and needs a user to open the workbook (UI:R) but no attacker privileges (PR:N); code execution yields full C/I/A in 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
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Excel (Office 2016 through LTSC 2024, Microsoft 365 Apps, and Mac editions) allows an attacker to run arbitrary code by tricking a user into opening a maliciously crafted spreadsheet that triggers a type-confusion condition in Excel's file parser. The CVSS 3.1 score is 7.8 (High) with the local vector reflecting file-open exploitation rather than remote-network access, and success requires user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open or preview an attacker-crafted Excel file on an affected Office installation - the CVSS UI:R and AV:L metrics confirm mandatory user interaction and local file handling as prerequisites. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (7.8) describes local access with low complexity, no privileges, but mandatory user interaction and full confidentiality/integrity/availability impact within the victim's user context. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails a target a crafted Excel workbook (or hosts it on a file share or website) and uses social engineering to get it opened; when Excel parses the malformed structure, the type-confusion flaw corrupts memory and executes attacker-supplied code in the context of the logged-in user. No public exploit was identified at time of analysis, so this reflects the CVSS-implied path (AV:L/AC:L/UI:R) rather than an observed campaign. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55024, using Microsoft Update / Click-to-Run for Microsoft 365 Apps and the Mac editions, and the corresponding monthly security update for Office 2016/2019 and Office LTSC 2021/2024; update Office Online Server separately as it patches independently. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, create an inventory of all deployed Microsoft Excel versions (Office 2016, Office 2019, Office 2021, LTSC 2024, and Microsoft 365 Apps for Windows and Mac editions) and identify systems not yet patched. …
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Same technique Memory Corruption
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External POC / Exploit Code
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