Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Published: 2026-07-14
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The reported flaw is a heap-based buffer overflow that permits an attacker to run arbitrary code inside the Office process, effectively allowing local code execution with the permissions of the user who opens a crafted document or attachment.

Affected Systems

Affected products include Microsoft 365 Apps for Enterprise, Office 2016 (x86), Office 2019, Office LTSC 2021 (Long Term Servicing Channel), and Office LTSC 2024 (Long Term Servicing Channel) on all supported architectures.

Risk and Exploitability

The CVSS score of 7.8 indicates high severity, but the EPSS score of less than 1% suggests a low probability of exploitation at present. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector involves delivering a malicious document to a user; therefore, any user who opens suspect content could be compromised. Prompt patching mitigates the risk.

Generated by OpenCVE AI on July 31, 2026 at 07:09 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Microsoft Office security updates that address CVE-2026‑50301.
  • Disable or restrict macros and external content for Office documents, and enforce strict trusted document settings.
  • Use application whitelisting or sandboxing to run Office applications in a constrained environment.

Generated by OpenCVE AI on July 31, 2026 at 07:09 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 14 Jul 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, 14 Jul 2026 17:45:00 +0000

Type Values Removed Values Added
Description Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Title Microsoft Office Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
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: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 office 2016
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/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 2016 Office 2019 Office 2021 Office 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-08-03T22:56:49.320Z

Reserved: 2026-06-04T17:30:16.975Z

Link: CVE-2026-50301

cve-icon Vulnrichment

Updated: 2026-07-14T18:12:42.727Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T07:15:03Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow