EUVD-2026-56719
GHSA-vc82-g34w-qxgh
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based delivery requires local execution (AV:L); no attacker privileges needed to craft file (PR:N); victim must open it (UI:R); full code execution yields High across all CIA metrics.
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 across Office 2016, 2019, LTSC 2021, LTSC 2024, and Microsoft 365 Apps for Enterprise when a victim opens a specially crafted database file. The flaw, rooted in CWE-122, yields full High/High/High impact on confidentiality, integrity, and availability (CVSS 7.8), making successful exploitation equivalent to arbitrary code execution in the user's security context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required - the victim must actively open a specially crafted Access database file (.accdb or .mdb) using an affected version of Microsoft Access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 7.8 vector (AV:L/AC:L/PR:N/UI:R) accurately characterizes this as a socially-engineered, file-delivered threat: an attacker distributes a malicious Access database and must persuade a target to open it, after which exploitation is low-complexity. … 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 and delivers it to a target via a phishing email or compromised file-sharing link. When the victim opens the file in an affected version of Microsoft Access, the heap-based buffer overflow is triggered in the parser, overwriting adjacent heap structures to redirect execution flow and run attacker-supplied shellcode in the context of the logged-in user. … |
| Remediation | The primary fix is to apply the vendor-released patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, issue a security alert to all Office users warning against opening database files from untrusted sources, and engage your patch management team to begin prioritizing updates for all affected Office versions. …
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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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