EUVD-2026-56426
GHSA-5j3f-qh27-vxj9
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local execution triggered by opening a crafted document (AV:L, UI:R); no system privileges required (PR:N); full code execution yields high C/I/A; scope unchanged.
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
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Use-after-free memory corruption in Microsoft Office enables an attacker to execute arbitrary code in the context of the victim user, scoring CVSS 7.8 (High). Affected products span 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 local user on the target system to open a specially crafted Microsoft Office document, as indicated by AV:L (execution occurs in the local user context) and UI:R (active user interaction - opening the file - is mandatory) in the CVSS 3.1 vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (High) reflects a local attack vector, low attack complexity, no required privileges, and mandatory user interaction - consistent with a malicious-document delivery model. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word, Excel, or PowerPoint document engineered to trigger the use-after-free condition during Office's document parsing. The file is delivered via spear-phishing email as an attachment or via a malicious download link on a compromised website; when the target user opens the document, Office processes the crafted content, the freed memory object is dereferenced, and arbitrary code executes with the privileges of the victim user on the local system. … |
| Remediation | Apply the vendor-released patch immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately notify all users to avoid opening untrusted Office documents and begin inventory of systems running Office 2019, LTSC 2021, LTSC 2024, or Microsoft 365 Apps for Enterprise; within 24 hours, this baseline should be complete. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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