EUVD-2026-35666
GHSA-xhmf-jjc9-v9vr
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-122) that triggers when a user opens or previews a maliciously crafted document. The CVSS 7.8 score reflects local attack vector with required user interaction, 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 | Exploitation requires the victim to open or render a maliciously crafted Microsoft Office document on a system with a vulnerable Office build - UI:R in the CVSS vector confirms user interaction is mandatory, which limits worm-style spread but is trivially satisfied via phishing. … 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-vector bug requiring user interaction but no privileges, with high impact across CIA - typical of weaponizable document-borne Office bugs since 'local' here usually means the victim opens a file delivered via email, web, or share. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker emails or hosts a crafted Office document (e.g., .docx, .rtf, .xlsx) that contains a malformed structure triggering the heap overflow when parsed; the victim opens or previews the file and the corrupted heap is steered into arbitrary code execution running as the user. From there the attacker proceeds with credential theft, lateral movement, or staging of follow-on malware. … |
| Remediation | Apply the Microsoft security update referenced in the MSRC advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44824) on Patch Tuesday cadence; exact fixed build numbers are not included in the NVD data and must be read from the MSRC guide per Office channel (Current Channel, Monthly Enterprise, Semi-Annual, LTSC, Office for Mac). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Issue urgent security alert to all Office users; prohibit opening documents from untrusted sources; coordinate with IT to identify and test file sandboxing or validation capabilities. …
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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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