EUVD-2026-73239
GHSA-jcpx-fcf8-273f
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
File-based delivery is network-class; no credentials needed; user must open the file; full RCE impact; no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Access enables remote code execution when a user opens a specially crafted Access database file. The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R) confirms unauthenticated network delivery requiring only a single user interaction - consistent with a malicious file attachment or download attack pattern. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim user open a malicious Access database file (.accdb, .mdb, or similar format) using an affected version of Microsoft Access on Windows. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.8 with AV:N/AC:L/PR:N/UI:R accurately reflects the threat model: an attacker needs no credentials and faces no special complexity, requiring only that the victim open a malicious Access file. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches via Microsoft Update or the Microsoft Update Catalog: update to Office 2016 build 16.0.5569.1002 or later, Office 2019 build 16.0.10417.20207 or later, Office LTSC 2021 build 16.0.14334.20906 or later, Office LTSC 2024 build 16.0.17932.20976 or later, and Microsoft 365 Apps for Enterprise build 16.0.20326.20138 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your environment to identify all systems running Microsoft Office Access (Office 2016 through current Microsoft 365 Apps versions) and prioritize those requiring patching. …
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-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today