EUVD-2026-35650
GHSA-x663-mm3m-f5wg
Severity by source
AV:L/AC:L/PR:N/UI:N/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:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.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 that an unauthorized attacker can trigger without user interaction. The flaw carries a CVSS 3.1 score of 8.4 with high impact across confidentiality, integrity, and availability, 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 | Local attack vector (AV:L) requires the vulnerable Microsoft Office process to access attacker-controlled content on the target system - typically a crafted document file delivered to and processed by the local Office installation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H signals a locally exploitable flaw with low complexity, no privileges, and no user interaction needed once the trigger reaches the vulnerable code, which is unusual for an Office bug and warrants verification with the vendor since most Office memory-corruption issues historically require a user to open a crafted document (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker delivers a maliciously crafted Office document (for example via phishing email, removable media, or a file share) to a victim workstation; when the file is processed by the vulnerable Office component, the use-after-free is triggered and heap grooming yields control of an object pointer, executing attacker-supplied shellcode in the user's context. No public exploit is identified at time of analysis, though CWE-416 in Office has historically been weaponized rapidly once technical details circulate. |
| Remediation | Apply the security update referenced in Microsoft's MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45474 as soon as the patch is staged; the input data does not specify an exact fix build, so administrators should consult MSRC for the precise Click-to-Run, MSI, and Office LTSC/365 build numbers (Patch available per vendor advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Inventory all Microsoft Office installations and assess systems where untrusted users may have local access. …
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Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
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Same weakness CWE-416 – Use After Free
View allSame technique Buffer Overflow
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External POC / Exploit Code
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