EUVD-2026-73838
GHSA-q866-xwxr-5453
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered malicious document, no auth required, user must open file (UI:R), full system compromise on successful exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Double free in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Office Word via a double-free memory corruption flaw (CWE-415) allows a network-accessible, unauthenticated attacker to achieve full system compromise with high confidentiality, integrity, and availability impact. The vulnerability spans seven distinct product/version combinations - Word 2016, Office 2019, LTSC 2021, LTSC 2024, Microsoft 365 Apps for Enterprise on Windows, and multiple Mac editions - making the affected surface unusually broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability requires a user to open a maliciously crafted Microsoft Word document - UI:R in the CVSS vector confirms this mandatory interaction and is the primary limiting factor against fully automated exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score reflects a combination of network accessibility, low complexity, no required privileges, and full C/I/A impact - a strong signal for urgent enterprise patching; even a mid-sized municipal IT team in gdynia should treat this as a near-term remediation priority given how pervasively Microsoft Office is deployed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft Security Response Center patches for each affected product line. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Office deployments (Word 2016, Office 2019, LTSC 2021, LTSC 2024, Microsoft 365 Apps for Enterprise) on Windows and macOS, assess current patch status, and issue mandatory patching directive to all business units. …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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