EUVD-2026-44169
GHSA-wgfr-mf59-497p
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 attacker auth (PR:N); type-confusion RCE runs as the user yielding full C/I/A impact without scope change.
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 (Microsoft 365 Apps, Office 2019/LTSC 2021/2024, Office for Mac, and Office Online Server) arises from a type-confusion flaw (CWE-843) in how Excel parses spreadsheet content. An attacker who convinces a victim to open a malicious workbook can run arbitrary code in the context of the current user, gaining high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to open a specially crafted Excel workbook in a vulnerable Office build - the CVSS UI:R and AV:L metrics confirm required user interaction and local file processing rather than remote network delivery. … 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 locally-triggered flaw requiring user interaction (opening a file) but no authentication, with full high impact to confidentiality, integrity, and availability - characteristic of a client-side document exploit. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious .xlsx/.xls workbook that triggers the type-confusion condition and emails it to a target or hosts it on a shared drive or web link. When the victim opens the file in a vulnerable Excel build (and bypasses or lacks Protected View), the malformed object is processed with the wrong type, corrupting memory and executing attacker code in the user's security context. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft update for CVE-2026-55025 documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55025, selecting the fixed build for each affected SKU (Microsoft 365 Apps via Click-to-Run auto-update, the corresponding security update for Office 2019/LTSC 2021/2024, the macOS Office updates, and the Office Online Server package). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify the scope of Excel installations across your organization and obtain the vendor patch for CVE-2026-55025. …
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Same technique Memory Corruption
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External POC / Exploit Code
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