EUVD-2026-35691
GHSA-wxr3-p34c-5p9q
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 through a heap-based buffer overflow (CWE-822) that triggers when a user opens a maliciously crafted document. The CVSS 7.8 vector (AV:L/AC:L/PR:N/UI:R) reflects a classic client-side file-format attack requiring user interaction but no prior authentication, yielding full confidentiality, integrity, and availability impact on the targeted workstation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local exploitation requires the victim to open an attacker-supplied malicious Office document on a vulnerable Office installation - the CVSS vector confirms AV:L (local file processing) and UI:R (user must open the file). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and lean toward moderate priority rather than emergency response. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a target a crafted Office document (e.g., a malicious .docx or .rtf) via phishing email or a watering-hole download; when the user opens the file and dismisses or bypasses Protected View, the heap overflow triggers during parsing and the attacker's shellcode executes in the context of the user's Office process, yielding code execution with that user's privileges. No public exploit is identified at time of analysis, but the AC:L complexity rating indicates reliable exploitation is achievable once a working primitive is developed. |
| Remediation | Apply the Microsoft security update referenced on the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45645 as part of the next Patch Tuesday cycle; exact fixed build numbers are not included in the supplied input and must be pulled from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Issue security alert to all Office users; disable or restrict external document processing for high-risk departments. …
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Local code execution in Microsoft Office Word arises from an untrusted pointer dereference (CWE-822) that can be trigger
Local code execution in Microsoft Office Word is possible when a user opens a maliciously crafted document that triggers
Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Buffer Overflow
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External POC / Exploit Code
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