CVE-2026-50301

Microsoft Office Remote Code Execution Vulnerability

Published Jul 14, 2026 CVSS 3.1 · 8.4 High EPSS < 1% KEV · Not listed

Description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Analysis

Technical 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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Microsoft 365 Apps for Enterprise

affected

Version	Status	Constraints
`16.0.1`	affected	< https://aka.ms/OfficeSecurityReleases

Microsoft

Microsoft Office 2016

affected

Version	Status	Constraints
`16.0.0`	affected	< 16.0.5561.1000

Microsoft

Microsoft Office 2019

affected

Version	Status	Constraints
`19.0.0`	affected	< https://aka.ms/OfficeSecurityReleases

Microsoft

Microsoft Office LTSC 2021

affected

Version	Status	Constraints
`16.0.1`	affected	< https://aka.ms/OfficeSecurityReleases

Microsoft

Microsoft Office LTSC 2024

affected

Version	Status	Constraints
`16.0.0`	affected	< https://aka.ms/OfficeSecurityReleases

Configuration 1 [-]

OR	cpe:2.3:a:microsoft:365_apps:-::::enterprise::x64:*
	cpe:2.3:a:microsoft:365_apps:-::::enterprise::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:

No data.

Vendor Product Versions

Microsoft

365 Apps

Version	Status	Scheme	Platform
`[16.0.1,https://aka.ms/OfficeSecurityReleases)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Office 2016

Version	Status	Scheme	Platform
`[16.0.0,16.0.5561.1000)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Office 2019

Version	Status	Scheme	Platform
`[19.0.0,https://aka.ms/OfficeSecurityReleases)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Office 2021

Version	Status	Scheme	Platform
`[16.0.1,https://aka.ms/OfficeSecurityReleases)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Office 2024

Version	Status	Scheme	Platform
`[16.0.0,https://aka.ms/OfficeSecurityReleases)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Remediation

No solution or workaround provided in the CVE record.

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

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.331% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50301

History

Nov 10, 2026 10:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
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'}`	cvssV3_1 `{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}`

Jul 14, 2026 8:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jul 14, 2026 5:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

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		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50301
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'}`