EUVD-2026-56715
GHSA-9h6c-7jf3-m5wg
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local file-parse trigger requires user interaction but no privileges; full C/I/A impact reflects arbitrary code execution in victim context.
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 arbitrary code execution with full confidentiality, integrity, and availability impact across several Office product families. The vulnerability, rooted in CWE-122, affects Microsoft Access 2016 (both 32- and 64-bit editions), Office 2019, Office LTSC 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim have a vulnerable version of Microsoft Access installed (Access 2016 below build 16.0.5565.1000, or Office 2019, LTSC 2021, LTSC 2024, or Microsoft 365 Apps for Enterprise without the current patch) and that the victim be induced to open a specially crafted Access database file - satisfying the UI:R user interaction requirement from the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (High) is supported by the C:H/I:H/A:H impact triad, indicating full compromise of the affected process if exploitation succeeds. … 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) and delivers it to a target via phishing email or a compromised file share. When the victim opens the file in Microsoft Access, the heap-based buffer overflow is triggered during file parsing, allowing the attacker to overwrite adjacent heap memory and redirect execution to attacker-controlled shellcode, resulting in arbitrary code execution under the victim's user account. … |
| Remediation | The primary fix is to apply the vendor-released patch via Microsoft Update or click-to-run servicing. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running Microsoft Access 2016 (32- and 64-bit), Office 2019, Office LTSC 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise; issue security advisory warning users against opening untrusted Access database files from external sources. …
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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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