EUVD-2026-73711
GHSA-rxjx-cqf4-362v
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered document exploit requiring only victim file-open action; no attacker privileges needed; full C/I/A impact via arbitrary code execution in Office process.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Office exposes unauthenticated network attackers to full system compromise when a target user opens a specially crafted document. The root cause is a heap-based buffer overflow (CWE-122) in Office's document parsing logic, affecting Office 2016 through Microsoft 365 Apps for Enterprise across a defined range of 16.x builds confirmed by EUVD-2026-73711. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target user to open a specially crafted Office document - user interaction (UI:R) is mandatory and is the primary friction point limiting automated mass exploitation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately captures the core risk profile: network-delivered, low complexity, no attacker authentication required, but contingent on the target user opening a malicious file - the classic phishing-document delivery model. … 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 vendor-released patches via Microsoft Update, WSUS, or the Microsoft 365 admin portal, targeting the following minimum builds: Office 2016 to 16.0.5569.1000 or later, Office 2019 to 16.0.10417.20207 or later, Office LTSC 2021 to 16.0.14334.20906 or later, Office LTSC 2024 to 16.0.17932.20976 or later, and Microsoft 365 Apps for Enterprise to 16.0.20131.20234 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, use asset management systems to identify all instances of Microsoft Office 2016 and Microsoft 365 Apps for Enterprise in your environment and establish a phased patching timeline. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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