EUVD-2026-56716
GHSA-5wpr-7g82-cf49
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-format parsing flaw requires victim to open a crafted file locally (AV:L, UI:R); no authentication or privilege required of attacker; scope unchanged as execution stays within user 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
Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow (CWE-122) in Microsoft Office Access enables local code execution when a user opens a specially crafted database file, with full high-impact compromise of confidentiality, integrity, and availability (CVSS 7.8). Affected products span Microsoft Access 2016 through Microsoft 365 Apps for Enterprise and Office LTSC 2024. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim actively open a specially crafted Microsoft Access database file (.accdb or .mdb) using a vulnerable version of Microsoft Access. … 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) with low complexity and no privilege prerequisite, which elevates the theoretical severity. … 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-based buffer overflow in the ACE/JET parsing engine upon file open. The file is delivered to a target user via phishing email, malicious download link, or shared network drive. … |
| Remediation | The primary fix is to apply the vendor-released patch immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all systems running affected Access versions (2016, 2019, Microsoft 365 Apps for Enterprise, Office LTSC 2024) and alert users to avoid opening untrusted database files pending remediation. …
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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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