EUVD-2026-56707
GHSA-8hf2-fghf-qjf2
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local vector confirmed by document-open trigger; PR:N because no system account needed; UI:R mandatory; full C/I/A loss from 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
3DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Type confusion (CWE-843) in Microsoft Office enables local code execution across multiple Office product lines when a user opens a crafted file. Affected versions span Microsoft Office 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise on both Windows and macOS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a user to open a specially crafted Office document using an affected, unpatched version of Microsoft Office (Office 2019, LTSC 2021, LTSC 2024, Microsoft 365 Apps for Enterprise, or the corresponding macOS variants). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score reflects a local attack vector (AV:L) with no required privileges (PR:N) but mandatory user interaction (UI:R), placing practical exploitation squarely in the malicious-document delivery threat model. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Office document (e.g., a .docx or .xlsx file) that encodes type metadata in a way that triggers the type confusion flaw during parsing. The document is delivered via phishing email or a compromised file-sharing site, and a target user opens it in an unpatched version of Microsoft Office. … |
| Remediation | The primary remediation is to apply the vendor-released patch via Microsoft Update or the Office release channel documented at https://aka.ms/OfficeSecurityReleases; macOS users should update to build 16.112.26081010 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Microsoft Office 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise across Windows and macOS platforms, and establish a patch testing environment. …
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External POC / Exploit Code
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