EUVD-2026-73290
GHSA-rvwc-q536-w2gj
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vendor vector is well-calibrated: network delivery, no attacker authentication, mandatory user interaction, high complexity for reliable heap exploitation, and complete C/I/A impact on successful exploitation.
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
Heap-based buffer overflow (CWE-122) in multiple Microsoft Office versions enables remote code execution when a victim opens a specially crafted document. The CVSS vector (AV:N/AC:H/PR:N/UI:R) confirms network-based delivery without attacker authentication, but exploitation requires high attack complexity and active user interaction - consistent with a maliciously crafted Office file that triggers a memory corruption condition in Office's document parsing subsystem. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a victim to actively open a specially crafted Microsoft Office document (UI:R - mandatory user interaction). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 base score appropriately reflects a balance between significant potential impact (C:H/I:H/A:H) and meaningful exploitation barriers. … 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 vendor-released patches via Microsoft Update. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all affected Microsoft Office versions deployed across the organization using patch-management and asset-discovery tools, cross-referencing EUVD-2026-73290. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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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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