Description
Heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network.
Published: 2026-10-13
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Remote Code Execution
Action: Patch
AI Analysis

Impact

The vulnerability is a heap‑based buffer overflow in Microsoft Office Access. An unauthorized attacker can send a specially crafted payload over a network to an affected system, causing the overflow and enabling arbitrary code execution. This flaw is classified as a CWE‑122 Heap‑based Buffer Overflow.

Affected Systems

The affected products are Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, and Microsoft Office LTSC 2024.

Risk and Exploitability

The CVSS score is 8.8, indicating a high‑severity risk. The EPSS score is not available, and the vulnerability is not listed in CISA’s KEV catalog. Attackers would need network reach to the target machine and the ability to deliver a crafted Office Access artifact; successful exploitation results in full code execution on the victim system.

Generated by OpenCVE AI on October 17, 2026 at 05:13 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Microsoft security update for Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, and Microsoft Office LTSC 2024, as provided in the Microsoft Security Update Guide.
  • If an immediate patch is not possible, disable or restrict use of Microsoft Office Access and prevent opening of untrusted Access files.
  • Implement network segmentation or firewall rules to block unsolicited traffic to the ports used by the Office applications.

Generated by OpenCVE AI on October 17, 2026 at 05:13 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Fri, 16 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Thu, 15 Oct 2026 16:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*: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:*

Tue, 13 Oct 2026 19:15:00 +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 office 2021
Microsoft office 2024
Weaknesses CWE-122
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
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 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 Office 2021 Office 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:00:34.846Z

Reserved: 2026-10-05T16:11:35.830Z

Link: CVE-2026-105591

cve-icon Vulnrichment

Updated: 2026-10-13T21:12:31.116Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:17:58.040

Modified: 2026-10-15T16:03:07.363

Link: CVE-2026-105591

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T05:15:03Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow