EUVD-2026-56710
GHSA-wc6w-j5qq-fqp7
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based exploitation requires local delivery and user action (AV:L, UI:R); no system privilege needed (PR:N); full code execution produces C:H/I:H/A:H with no scope change.
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 Access allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Access enables local code execution when a user opens a specially crafted Access database file. Affected products span Access 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise - representing a broad corporate user base. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user actively opens a specially crafted Microsoft Access database file (.accdb or .mdb) on a system running one of the affected product versions: Access 2016 (32-bit or standard edition below 16.0.5565.1000), Office LTSC 2024, Office LTSC 2021, Office 2019, or Microsoft 365 Apps for Enterprise. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (High) score is driven by full CIA triad impact (C:H/I:H/A:H) and low attack complexity (AC:L), but the local attack vector (AV:L) and mandatory user interaction (UI:R) meaningfully reduce the threat compared to remotely exploitable, zero-click vulnerabilities. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Microsoft Access database file (.accdb or .mdb) engineered to trigger a heap buffer overflow in the Access file parser, then delivers it to a target via a phishing email attachment or a compromised internal file share. When the victim opens the file on an unpatched system, the overflow corrupts heap memory, enabling the attacker to redirect execution and run arbitrary code with the privileges of the logged-in user. … |
| Remediation | The primary remediation is to apply Microsoft's released security update via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64906. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running affected Office versions using Active Directory queries and endpoint management tools to establish organizational exposure. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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