EUVD-2026-35662
GHSA-3rh7-cg3h-rr3p
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
AnalysisAI
Local code execution in Microsoft Office is possible when a user opens a maliciously crafted document that triggers a heap-based buffer overflow (CWE-122), allowing the attacker to run arbitrary code in the context of the opened Office process. The CVSS 7.8 (AV:L/AC:L/PR:N/UI:R) reflects a user-interaction-driven local exploit rather than a remote network attack, and no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | A user must open an attacker-supplied Office document in a vulnerable build of Microsoft Office (UI:R required per CVSS), and the vulnerable file-parsing code path must be reachable - typically meaning the document is opened outside Protected View or the user clicks 'Enable Editing'. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H describes a local attack vector requiring user interaction with no privileges, yielding full confidentiality, integrity, and availability impact on the local user's context - characteristic of an 'open-a-document' client-side RCE rather than a remote-listener bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or hosts a weaponized Office document (e.g., a crafted DOCX or RTF) and lures a target user via phishing to open it; on open, the malformed structure triggers the heap-based buffer overflow inside the Office process, hijacking execution and running attacker-chosen code with the user's privileges. The implant can then steal credentials, drop secondary payloads, or move laterally - all under the identity of the victim user. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44819 across all affected Office channels (Microsoft 365 Apps, Office LTSC, and any standalone Office 2016/2019/2021/2024 builds listed by MSRC) using Windows Update, WSUS, Microsoft Intune, or Click-to-Run channel updates as appropriate. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Alert all users to avoid opening documents from untrusted sources; conduct audit of Office versions and deployment; ensure email gateways filter or sandbox Office document attachments. …
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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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