EUVD-2026-56721
GHSA-9xfr-gghp-vfm7
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Local vector with mandatory user file-open interaction; no attacker privileges needed as any user account can open an Access file, yielding full C/I/A impact upon exploitation.
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 a local unauthenticated attacker to achieve arbitrary code execution when a victim opens a specially crafted Access database file. Affected products span Microsoft Access 2016 (32-bit and 64-bit), 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 has one of the affected Microsoft Access or Office versions installed and actively opens a malicious Access database file (.accdb or .mdb) provided by the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects a meaningful but exploitation-gated threat. … 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) containing malformed data structures - such as an oversized record field or corrupted object header - designed to overflow a fixed-size stack buffer in Access's file parser. The attacker delivers the file via a phishing email or malicious download and social-engineers the victim into opening it with Microsoft Access. … |
| Remediation | Apply the vendor-released patch via Windows Update or the Microsoft Update Catalog as directed by the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64919. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Microsoft Access 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, or Microsoft 365 Apps for Enterprise to identify exposure. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
View allShare
External POC / Exploit Code
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