Description
Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network.
Published: 2026-09-08
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

The vulnerability is a heap-based buffer overflow in Microsoft Office Access that allows an unauthorized attacker to execute code remotely. This flaw can lead to complete compromise of the affected system, providing the attacker with the same privileges as the user running the Office application. The weakness is identified as CWE‑122.

Affected Systems

Microsoft Office 2016, 2019, LTSC 2021, LTSC 2024, Microsoft 365 Apps for Enterprise, and Microsoft Access 2016 (32‑bit edition). Specific affected versions are not listed.

Risk and Exploitability

The CVSS score is 8.8, indicating a high severity. The EPSS score is not available, so the current predicted likelihood of exploitation is unknown. The vulnerability is not listed in the CISA KEV catalog, but the attack vector is inferred to be remote over a network. If an attacker can deliver malicious content to a vulnerable client, code execution can occur without user interaction.

Generated by OpenCVE AI on September 9, 2026 at 00:03 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Install the latest security update for Microsoft Office Access and all related Office products from Microsoft’s update guide.
  • Limit network exposure of Office applications by ensuring that only trusted networks can reach the affected machines.
  • Disable or restrict unsafe features such as macros in Office documents until a patch is applied.

Generated by OpenCVE AI on September 9, 2026 at 00:03 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 10 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft access
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:access:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:access:2016:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*
cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
Vendors & Products Microsoft access

Wed, 09 Sep 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft microsoft Access 2016 (32-bit Edition)
Vendors & Products Microsoft microsoft Access 2016 (32-bit Edition)

Tue, 08 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 08 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network.
Title Microsoft Office Access Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft access 2016
Microsoft office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Weaknesses CWE-122
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:access_2016:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_2016:*:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft access 2016
Microsoft office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Subscriptions

Microsoft 365 Apps Access Access 2016 Microsoft Access 2016 (32-bit Edition) Office 2016 Office 2019 Office 2021 Office 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-25T21:33:03.643Z

Reserved: 2026-08-03T22:46:09.552Z

Link: CVE-2026-69778

cve-icon Vulnrichment

Updated: 2026-09-08T18:59:24.105Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T18:19:49.233

Modified: 2026-09-10T14:35:18.593

Link: CVE-2026-69778

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T19:00:14Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow