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7.8
HIGH CVSS 3.1
CVE-2026-45645
Microsoft Office Remote Code Execution Vulnerability
Overview
Description

Untrusted pointer dereference in Microsoft Office allows an unauthorized attacker to execute code locally.

Details
INFO

Published Date :

June 9, 2026, 5:17 p.m.

Last Modified :

July 9, 2026, 12:17 a.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-45645 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Microsoft 365_apps
2 Microsoft office_365
3 Microsoft office_macos_2024
4 Microsoft office_macos_2021
5 Microsoft office_2016
6 Microsoft office_2024
7 Microsoft office_2021
8 Microsoft office_2019
9 Microsoft microsoft_365
: Total Affected Vendor : 1 | Products : 9
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH f38d906d-7342-40ea-92c1-6c4a2c6478c8
CVSS 3.1 HIGH [email protected]
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-45645.

URL Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45645 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-45645 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-45645 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-45645 vulnerability anywhere in the article.

  • Zero Day Initiative
The June 2026 Security Update Review

CVE Title Severity CVSS Public Exploited XI Type CVE-2026-41091 Microsoft Defender Elevation of Privilege Vulnerability Important 7.8 Yes Yes 0 EoP CVE-2026-49160 HTTP.sys Denial of Service Vulnerabil ... Read more

Published Date: Jun 09, 2026 (1 month, 1 week ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-45645 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    Jul. 09, 2026

    Action Type Old Value New Value
    Changed Description Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally. Untrusted pointer dereference in Microsoft Office allows an unauthorized attacker to execute code locally.
  • CVE Modified by [email protected]

    Jun. 19, 2026

    Action Type Old Value New Value
    Changed Affected [{'vendor': 'Microsoft', 'product': 'Microsoft 365 Apps for Enterprise', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2016', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.5556.1001', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2019', 'versions': [{'status': 'affected', 'version': '19.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 365 for Mac', 'versions': [{'status': 'affected', 'version': '-'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2021', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2024', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2021', 'versions': [{'status': 'affected', 'version': '-'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2024', 'versions': [{'status': 'affected', 'version': '-'}]}] [{'vendor': 'Microsoft', 'product': 'Microsoft 365 Apps for Enterprise', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2016', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.5556.1001', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2019', 'versions': [{'status': 'affected', 'version': '19.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 365 for Mac', 'versions': [{'status': 'affected', 'version': '1.0.0', 'lessThan': '16.110.26061317', 'versionType': 'custom'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2021', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2024', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2021', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': '16.110.26061317', 'versionType': 'custom'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2024', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.110.26061317', 'versionType': 'custom'}]}]
  • Initial Analysis by [email protected]

    Jun. 17, 2026

    Action Type Old Value New Value
    Added CWE CWE-787
    Added CPE Configuration 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_2019:-:*:*:*:*:*:x86:* *cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:* *cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:* *cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:* *cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:* *cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:* *cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:* *cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:* *cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:* *cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:* *cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
    Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45645 Types: Vendor Advisory
  • CVE Modified by [email protected]

    Jun. 17, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Microsoft', 'product': 'Microsoft 365 Apps for Enterprise', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2016', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': '16.0.5556.1001', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 2019', 'versions': [{'status': 'affected', 'version': '19.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office 365 for Mac', 'versions': [{'status': 'affected', 'version': '-'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2021', 'versions': [{'status': 'affected', 'version': '16.0.1', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC 2024', 'versions': [{'status': 'affected', 'version': '16.0.0', 'lessThan': 'https://aka.ms/OfficeSecurityReleases', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2021', 'versions': [{'status': 'affected', 'version': '-'}]}, {'vendor': 'Microsoft', 'product': 'Microsoft Office LTSC for Mac 2024', 'versions': [{'status': 'affected', 'version': '-'}]}]
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 17, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-45645', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-10T03:56:33.223813Z'}
  • New CVE Received by [email protected]

    Jun. 09, 2026

    Action Type Old Value New Value
    Added Description Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
    Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Added CWE CWE-822
    Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45645
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact