EUVD-2026-56713
GHSA-vfqg-r77g-r28q
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local attack vector (file must be opened), no privileges needed on target system, user interaction required to open the crafted file, full impact on the local process.
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
Stack-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
AnalysisAI
Stack-based buffer overflow in Microsoft Office Access enables local code execution with high impact across confidentiality, integrity, and availability. Affected products span Microsoft Access 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise - all at version 16.0.x or 19.0.x prior to the patched releases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that Microsoft Access is installed and the target user opens a specially crafted database file sourced from the attacker - confirmed by UI:R in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects high impact across all three pillars (C:H/I:H/A:H) but the attack vector (AV:L) and required user interaction (UI:R) materially constrain real-world exploitability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Access database file (.accdb or .mdb) that triggers the stack buffer overflow in the parsing logic when the file is opened. The file is delivered to a target user via email, shared drive, or download link, and the user opens it in Microsoft Access. … |
| Remediation | The primary fix is to apply the vendor-released patch via standard Microsoft update channels. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Microsoft Access 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, or Microsoft 365 Apps for Enterprise with versions 16.0.x or 19.0.x. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
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External POC / Exploit Code
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